Mass Gainer Milkshake Recipe for a Thick, Creamy Shake

This mass gainer milkshake blends milk, oats, banana, peanut butter, Greek yogurt, and protein powder into a thick, satisfying drink. It takes about eight minutes, needs no cooking, and is easy to adjust for sweetness, texture, or the ingredients you have on hand.

Ingredients

2 cups whole milk (480 ml): This makes a creamy base. Use dairy or an unsweetened fortified plant milk; thinner plant milks make a lighter shake.
½ cup rolled oats (40 g): Oats add body and a mild, grain-like flavor. Use old-fashioned rolled oats for a smooth blend; quick oats also work.
1 medium ripe banana (about 120 g peeled): A ripe banana brings sweetness and helps make the shake thick. For a colder shake, use a frozen banana and reduce the ice.
2 tablespoons peanut butter (32 g): Creamy peanut butter blends easily. Choose salted or unsalted according to taste, and stir natural peanut butter well before measuring.
½ cup plain Greek yogurt (120 g): Full-fat yogurt gives the drink a rich, smooth texture. Regular plain yogurt works too, though the shake will be a little less thick.
1 scoop vanilla protein powder (about 30 g): Use the scoop size listed on your powder, since scoop weights vary. A plain or chocolate version also works, with a different flavor.
1 tablespoon honey (21 g): This is an optional sweetener, especially useful with unsweetened protein powder or less-ripe banana. Maple syrup can replace it in the same amount.
1 cup ice cubes (about 140 g): Ice chills and thickens the shake. Use less if the banana is frozen or if you prefer a softer, less frosty texture.
¼ teaspoon ground cinnamon (about 0.6 g): Cinnamon complements the banana and peanut butter. Leave it out, or use a small pinch of cocoa for a different flavor.

Instructions

Set up the blender. Add the milk first, followed by the oats. Let the oats sit in the milk while you measure the other ingredients; this brief pause is not required, but it can help them blend evenly. If your blender is small, divide the ingredients between two batches rather than filling it beyond its marked capacity.
Add the soft ingredients. Put in the banana, peanut butter, Greek yogurt, protein powder, honey, and cinnamon. Breaking the banana into several pieces makes it easier for the blades to catch. If you are using a very thick natural peanut butter, spoon it in rather than trying to pour it.
Blend until smooth. Secure the lid and blend for about 30 seconds. Stop the blender, scrape down the sides with a spatula if oats or powder cling there, then blend for another 15–30 seconds. The finished mixture should look even, with no dry pockets of powder or visible oat pieces.
Adjust the consistency. For a thinner drink, blend in more milk, 1 tablespoon (15 ml) at a time. For a thicker shake, add a few ice cubes and blend again. Taste before adding extra sweetener: ripe banana, flavored protein powder, and honey can all contribute sweetness.
Pour and serve promptly. Divide the shake between two glasses. If you want a garnish, add a light sprinkle of cinnamon or a small drizzle of peanut butter. Serve with a straw or a wide spoon, since this recipe is meant to be thick enough to sip slowly.

Tips

Blend in the right order. Liquids near the blades help the ingredients circulate, while oats and powder added on top are less likely to stick to the bottom. If your blender struggles, start with the milk and oats alone for 10 seconds, then add the rest.
Control the sweetness after blending. Protein powders differ in sweetness, and ripe bananas can be especially sweet. Start with the listed honey if you like a sweeter shake, or leave it out and add a little more only after tasting.
Use a substitute that fits the texture. Almond or sunflower seed butter can replace peanut butter in equal amounts. Sunflower butter has a distinct toasted flavor, while almond butter is usually milder. Check labels if you are avoiding a particular allergen.
Avoid overfilling the blender. The oats and ice expand the mixture as they move, and a crowded jar may blend unevenly. If needed, make two smaller batches and combine them in a pitcher, stirring before serving.

Serving Suggestions

Serve the milkshake cold as a substantial breakfast-style drink, an afternoon snack, or a quick option when you want something more filling than plain milk. The recipe makes two modest glasses; pour it into one larger glass if you prefer a single generous portion. A chilled glass helps it stay cold while you drink, especially on a warm day.

For a simple topping, dust each glass with cinnamon or cocoa, or add a few thin banana slices. A small spoonful of peanut butter swirled over the top looks appealing but makes the drink richer. If serving alongside food, pair it with toast, fruit, or a savory breakfast item rather than adding several sweet toppings that compete with the banana and honey.

Variations

Chocolate banana: Use chocolate protein powder, or blend in 1 tablespoon (5 g) unsweetened cocoa powder. Cocoa is less sweet than flavored powder, so taste the finished shake before deciding whether to add honey. A pinch of salt can sharpen the chocolate flavor if the peanut butter is unsalted.

Berry version: Replace the banana with ¾ cup (105 g) frozen strawberries or blueberries. The shake will be less creamy and more tart, so keep the yogurt and add honey to taste. Frozen berries also make it cold without as much ice; begin with ½ cup (70 g) ice and add more only if needed.

Plant-based version: Use 2 cups (480 ml) unsweetened soy milk or oat milk, a dairy-free yogurt, and a plant-based protein powder. Soy milk tends to give a creamier result, while oat milk has a mild cereal flavor that suits the oats. Check that the powder dissolves well in cold liquids, since some blends need a little extra blending.

Date-sweetened version: Replace the honey with 2 soft, pitted dates (about 16 g total). Blend them with the milk first until finely broken down, then add the remaining ingredients. Firmer dates can leave small pieces, so soak them in warm water for 10 minutes and drain before blending if your blender is not powerful.

Different nut-butter flavor: Swap the peanut butter for 2 tablespoons (32 g) almond butter, cashew butter, or sunflower seed butter. Each changes the flavor and thickness slightly. If the replacement is unsalted, a small pinch of salt can bring the flavors into balance, but taste before adding any.

Storage and Reheating

This shake is best immediately after blending, when the ice is cold and the texture is most uniform. If you have leftovers, transfer them to a clean, covered jar or bottle and refrigerate within 2 hours of making it. For the best flavor and texture, drink it within 24 hours; it can be kept refrigerated for up to 2 days, but the banana may darken and the mixture may separate.

Before drinking a stored shake, shake the sealed container vigorously or stir it well. If it has thickened, blend it briefly with a splash of milk. Do not leave it at room temperature for more than 2 hours. This is a cold drink, so reheating is not recommended. You can freeze leftovers in a freezer-safe container for up to 1 month, leaving room for expansion; thaw in the refrigerator and reblend, knowing that the texture may be less smooth.

Frequently Asked Questions

Can I make this without protein powder?
Yes. Leave it out and blend the remaining ingredients as written. The shake will have a milder flavor and a slightly looser texture. If you want a thicker result without powder, add a little more Greek yogurt or use a frozen banana, then adjust the milk as needed.

Do I need to soak the oats first?
No. Rolled oats soften as they blend with the milk, so a separate soaking step is not necessary. If your blender leaves a grainy texture, soak the oats in the measured milk for 10–15 minutes before blending. That adds waiting time, but can make the finished drink smoother.

Can I make the shake ahead?
You can blend it up to a day ahead and keep it covered in the refrigerator, though the texture is freshest right after blending. It may separate as it sits, which is normal for a drink made with oats, yogurt, and fruit. Shake or stir it thoroughly before serving, and add a splash of milk if it has become too thick.

Why is my milkshake gritty?
Grittiness can come from oats that have not been blended long enough, protein powder that clumped, or a blender that is too full to circulate ingredients. Blend the milk and oats first, add the other ingredients, and run the blender for another 15–30 seconds. Scrape down the sides if dry powder sticks above the liquid.

Can I use fresh banana instead of frozen?
Yes. The recipe is written for a fresh ripe banana and includes ice to chill the drink. A frozen banana makes the shake thicker and colder, so reduce or omit some of the ice, then add more only if you want a frostier consistency.

What can I use instead of peanut butter?
Almond butter, cashew butter, or sunflower seed butter can be used in the same quantity. Each has its own flavor, and the final thickness may vary depending on how runny the spread is. Tahini is another possible swap, though its savory, slightly bitter taste changes the shake more noticeably; start with 1 tablespoon and taste before adding more.

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