Cupcake Royale Seattle-Style Vanilla Cupcakes

Cupcake Royale Seattle is known for bakery-style cupcakes with tender, buttery cake and generous swirls of frosting. This home version makes vanilla cupcakes topped with a rich vanilla buttercream; the recipe is inspired by that Seattle cupcake-shop style, not a claim to reproduce a proprietary bakery recipe.

Ingredients

1½ cups (190 g) all-purpose flour
1½ teaspoons (6 g) baking powder
¼ teaspoon (1.5 g) fine salt
½ cup (113 g) unsalted butter, softened
¾ cup (150 g) granulated sugar
2 large eggs, at room temperature
2 teaspoons (10 ml) pure vanilla extract
½ cup (120 ml) whole milk, at room temperature
For the buttercream: 1 cup (226 g) unsalted butter, softened
3½ cups (420 g) powdered sugar, sifted
2 teaspoons (10 ml) pure vanilla extract
2 tablespoons (30 ml) whole milk or heavy cream, plus up to 1 tablespoon (15 ml) more as needed
⅛ teaspoon (0.75 g) fine salt
Optional: 2 tablespoons (20 g) sprinkles, for decorating

Instructions

Set a rack in the middle of the oven and heat it to 350°F (175°C). Line a 12-cup muffin pan with paper liners. Let the butter, eggs, and milk come to room temperature so the batter combines smoothly.
In a medium bowl, whisk together the flour, baking powder, and salt. In a separate large bowl, beat the ½ cup (113 g) butter and granulated sugar with an electric mixer on medium speed for 2 to 3 minutes, until pale and fluffy. Scrape down the bowl once.
Beat in the eggs one at a time, mixing just until each is incorporated. Mix in the vanilla. If the mixture looks slightly curdled, continue; it should come together when the flour and milk are added.
Add about one-third of the flour mixture and mix on low just until no dry flour remains. Mix in half the milk, then repeat, finishing with the last third of flour. Stop as soon as the batter is smooth; overmixing can make cupcakes dense.
Divide the batter evenly among the liners, filling each about two-thirds full. Bake for 16 to 18 minutes, rotating the pan once if your oven browns unevenly. The tops should spring back lightly when pressed, and a toothpick inserted in the center should come out clean or with a few moist crumbs.
Cool the cupcakes in the pan for 5 minutes, then transfer them to a wire rack and cool completely, about 30 minutes. Do not frost warm cupcakes: the buttercream will soften and slide off.
Make the buttercream while the cakes cool. Beat the remaining 1 cup (226 g) butter on medium speed for 2 minutes until creamy. Add the powdered sugar in three additions, mixing on low at first to avoid a cloud of sugar. Beat in the vanilla, 2 tablespoons (30 ml) milk or cream, and salt.
Increase the mixer to medium-high and beat for 2 to 3 minutes, scraping the bowl as needed, until the frosting is fluffy. If it is too stiff to spread or pipe, add more milk or cream 1 teaspoon at a time. If it is too soft, beat in a little more sifted powdered sugar or chill it for 10 minutes.
Spread or pipe the buttercream onto fully cooled cupcakes. Add sprinkles if using. For a tall swirl, use a piping bag fitted with a large star tip; otherwise, an offset spatula makes an attractive, bakery-style finish.

Tips

Measure flour by spooning it into the measuring cup and leveling the top, or weigh it. Scooping directly from the bag packs in extra flour and can make the crumb dry.
Room-temperature ingredients blend more evenly. If you forgot to soften butter, cut it into small cubes and let it stand for about 15 minutes; avoid melting it.
For a slightly tangier cake, replace 2 tablespoons (30 ml) of the milk with plain yogurt or sour cream. Keep the total liquid amount close to ½ cup (120 ml).
Use a light hand with the mixer once flour is added. A few seconds of extra mixing can develop gluten and leave the cupcakes tougher instead of tender.

Serving Suggestions

Serve the cupcakes at room temperature, when the buttercream is soft and the cake’s vanilla flavor is easiest to appreciate. They pair well with coffee, black tea, or a glass of cold milk. For a party, arrange them on a platter and add sprinkles shortly before serving so their colors remain bright. If the room is warm, bring the cakes out of the refrigerator about 30 minutes before serving.

Variations

For a chocolate version, replace ¼ cup (30 g) of the flour with ¼ cup (25 g) unsweetened cocoa powder and add 1 tablespoon (15 ml) extra milk if the batter seems unusually thick. For a citrus note, add 1 teaspoon finely grated lemon or orange zest to the butter and sugar before creaming. To make a simple filled cupcake, remove a small center plug after cooling, spoon in about 1 teaspoon (5 ml) of jam, lemon curd, or chocolate spread, and replace a little cake over the filling before frosting. Keep fillings modest so the cupcakes hold their shape.

Storage and Reheating

Store frosted cupcakes in a covered container in the refrigerator for up to 4 days. Because the frosting contains butter and milk, do not leave them at room temperature for more than 2 hours; refrigerate them sooner if the room is hotter than 90°F (32°C). Let refrigerated cupcakes sit at room temperature for about 30 minutes before serving. There is no need to reheat them.

For longer storage, freeze unfrosted cupcakes in a tightly sealed container for up to 2 months. Thaw them covered at room temperature, then frost. Buttercream can also be refrigerated in an airtight container for up to 1 week or frozen for up to 2 months; bring it back to a spreadable temperature and beat briefly before using. Do not freeze cupcakes with delicate decorations that may become wet or lose their shape as they thaw.

Frequently Asked Questions

Can I make the cupcakes without an electric mixer?
Yes. Use a sturdy whisk or wooden spoon to cream the softened butter and sugar until lighter and fluffy, then beat in the eggs one at a time. Fold in the dry ingredients and milk gently; the process takes more effort, but the goal is still a smooth batter without overmixing.

Why did my cupcakes sink in the middle?
Common causes include opening the oven door too early, inaccurate baking-powder measurement, or underbaking. Check that your baking powder is fresh, avoid opening the oven during the first 14 minutes, and test the centers before removing the pan.

Can I use salted butter?
Yes. Use the same amount, but omit the added salt in both the cake and frosting. Salt levels vary by brand, so taste the buttercream before adding anything extra.

Can I make the frosting ahead?
Yes. Refrigerate it in an airtight container for up to 1 week or freeze it for up to 2 months. Let it soften until workable, then beat it briefly; add a teaspoon of milk at a time if it needs loosening.

How do I know the cupcakes are done without a thermometer?
A thermometer is not needed for this cake. The centers should spring back when lightly pressed, and a toothpick inserted into the middle should come out clean or with a few crumbs, not wet batter.

Can I bake this as a small cake?
The batter can be baked in a greased and lined 8-inch (20 cm) round pan, but the timing will differ. Begin checking at 22 minutes and continue until the center springs back and a toothpick comes out clean; cool completely before frosting.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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