DIY French Onion Soup Mix for Soups, Dips, and More

DIY French onion soup mix is a savory blend of dried onion, bouillon, and pantry spices inspired by the familiar flavors of French onion soup. Stir it into broth for a quick soup base, or use it to season dips, potatoes, and other dishes; making it yourself lets you adjust the salt and choose beef or vegetable bouillon.

Ingredients

1/4 cup (8 g) dried onion flakes
2 tablespoons (12 g) beef bouillon granules
1 tablespoon (7 g) onion powder
1 teaspoon (3 g) garlic powder
1 teaspoon (1 g) dried parsley
1/2 teaspoon (1 g) finely ground black pepper
1/4 teaspoon (0.5 g) celery seed, optional
1/4 teaspoon (1 g) granulated sugar, optional

This makes about 1/2 cup (roughly 8 tablespoons), depending on how fine the bouillon and spices are. The full batch seasons about 16 portions of soup when you use 2 tablespoons per 4 cups (950 ml) of broth, or it can be divided among several smaller uses. Bouillon brands vary in saltiness, so this blend has no additional salt; taste the finished dish before seasoning it further.

Instructions

Measure the onion flakes, bouillon granules, onion powder, garlic powder, parsley, and pepper into a small bowl. Add the celery seed and sugar if using. For the most consistent measurement, lightly spoon powdered seasonings into measuring spoons rather than packing them down.
Whisk thoroughly for about 30 seconds, breaking up any clumps of onion powder or bouillon. The blend should look evenly distributed, with visible onion flakes throughout. If your bouillon granules are especially coarse, crush them gently with the back of a spoon so they mix and dissolve more evenly.
Transfer the mixture to a clean, completely dry, airtight jar or small container. A funnel helps keep the flakes and powder from spilling. Label the container with the name and date, and note whether you used beef or vegetable bouillon.
To make a simple soup, whisk 2 tablespoons of mix into 4 cups (950 ml) of water or broth in a saucepan. Bring it to a gentle simmer, stirring until the granules dissolve, then taste and adjust the seasoning. For a fuller soup, add sliced, browned onions and serve with toasted bread and melted cheese; those additions are separate from this dry-mix recipe.
For a smaller amount, use 1 tablespoon of mix per 2 cups (475 ml) of liquid. Start with water if you want the blend’s flavor to be more prominent, or use unsalted broth for a richer base. Avoid adding extra salt until the soup is hot and you have tasted it.

Tips

Choose the right onion texture. Dried onion flakes give the mix a little texture and soften as they sit in hot liquid. Onion powder alone will make a smoother blend, but it will not provide the same small pieces of onion. If you substitute powder for flakes, use about 2 tablespoons (14 g) onion powder in place of the 1/4 cup of flakes, then expect the blend to be more concentrated and less textured.
Check the bouillon label before adding salt. Some granules are quite salty, while low-sodium versions are milder. If you use a low-sodium product, season the finished soup to taste instead of automatically adding salt to the dry mix. Granule sizes and weights differ by brand, so the gram measure is approximate.
Keep moisture out. Use dry measuring spoons and a dry container. A damp spoon can cause clumps, and steam from a cooking pot can introduce moisture if you shake the mix directly over it. Spoon out the amount you need before cooking.
Make it suit the dish. Leave out celery seed if you dislike its distinctive flavor, or omit the optional sugar for a less rounded, more savory blend. The small amount of sugar is not meant to make the mix taste sweet; it simply softens the sharp edge of the seasonings.

Serving Suggestions

For a quick soup, dissolve 2 tablespoons of mix in 4 cups (950 ml) of water or unsalted broth. Simmer for 5 to 10 minutes so the dried onion softens, then taste before adding salt. This makes about four modest cups, or roughly four small servings. The seasoning is a shortcut for flavor, not a complete replacement for slowly browned fresh onions if you want the deeper, sweeter character of a traditional onion soup.

Use the blend as a dip seasoning by stirring 1 tablespoon into 1 cup (240 ml) of sour cream, plain Greek-style yogurt, or a mixture of the two. Refrigerate the dip for 20 to 30 minutes before serving so the dried onion can hydrate and the flavor can settle. Taste it after chilling; a pinch of black pepper or a spoonful of finely chopped fresh chives can brighten it without adding much effort.

It also works in weeknight dishes. Sprinkle 1 to 2 teaspoons over cubed potatoes before roasting, stir a teaspoon into softened butter for a savory spread, or mix a little into the liquid used to cook rice or lentils. When seasoning a dish that already contains stock, cheese, or another salty ingredient, begin with less mix and adjust only after cooking.

Variations

Vegetarian version: Replace the beef bouillon with an equal amount of vegetable bouillon granules. The result is still savory, though its flavor will depend on the vegetable bouillon and may be less rich or beefy than the original. Check the package to confirm that the product suits your dietary needs, since formulations vary.

Gluten-free version: Choose bouillon granules labeled gluten-free rather than assuming all bouillon is suitable. Bouillon ingredients differ, and some products may contain wheat-based ingredients or have cross-contact warnings. The remaining ingredients in this blend are commonly available in gluten-free form, but labels are the best guide.

More onion-forward: Add 1 tablespoon (7 g) onion powder, or replace some of the black pepper with another teaspoon of dried onion flakes. This makes the blend taste more directly of onion. If adding powder, expect the mix to clump more readily and use a dry spoon each time.

Herb variation: Swap the parsley for 1/2 teaspoon (about 0.5 g) dried thyme, or use a small pinch of both. Thyme gives the mixture a more herbal aroma and can be especially good in broth. Keep the quantity restrained so it does not overpower the onion and bouillon.

Storage and Reheating

Keep the dry mix in a sealed, dry container in a cool cupboard, away from the stove, sunlight, and steam. For the clearest flavor, use it within 2 to 3 months; dried spices do not suddenly become unsafe at that point, but their aroma and strength gradually fade. Discard the mix if it becomes damp, develops an unusual smell, or shows any sign of mold. Do not store it in a container that has not been completely dried after washing.

Once mixed into soup, handle it as a cooked leftover: refrigerate within 2 hours in a covered container and use within 3 to 4 days. Reheat soup on the stove or in the microwave until it reaches 165°F (74°C), stirring so it heats evenly. Freeze soup in well-sealed portions for about 2 to 3 months for best quality; thaw it in the refrigerator and reheat to 165°F (74°C). The dry seasoning itself does not need reheating.

Frequently Asked Questions

How much homemade mix should I use in soup?
Start with 2 tablespoons per 4 cups (950 ml) of water or broth. That ratio makes a flavorful base, but bouillon strength varies, so taste it after the granules dissolve. Add a little more mix if needed, or dilute with extra liquid if the soup tastes too strong.

Can I use onion powder instead of dried onion flakes?
Yes. For this batch, use about 2 tablespoons (14 g) onion powder in place of the 1/4 cup (8 g) flakes. The dry mixture will be smoother and more concentrated, and the finished soup will not have the small soft pieces of onion that flakes provide. Reduce the amount used in a dish at first, then adjust to taste.

Can I make the mix without bouillon?
You can, but it will be a spice-and-onion blend rather than a complete soup seasoning. Omit the bouillon and add the appropriate stock or bouillon separately when making soup. For dips or other dishes, season with salt to taste only after combining the mix with the other ingredients.

Is this the same as a packet of store-bought French onion soup mix?
It is a homemade alternative with a similar onion-and-bouillon flavor, but packet formulas vary and may include different starches, flavorings, or amounts of salt. This recipe uses a short list of pantry ingredients and leaves the salt level dependent on your bouillon. It may not behave exactly like a particular packaged product in every recipe.

Can I double or halve the recipe?
Yes. Multiply or divide every ingredient by the same amount, then whisk the blend especially well so the smaller quantities of pepper and optional celery seed are evenly distributed. If you scale it up, store only what you expect to use within a few months so the seasonings retain their aroma.

Why does my mix clump?
Powdered onion, garlic, and bouillon can clump when exposed to humidity or a damp spoon. Break up small dry clumps with a clean fork before use, and move the blend to a dry airtight container if moisture has entered. If it smells musty, looks moldy, or has become wet, discard it rather than trying to dry it out.

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