Fluffy Grape Soda Cupcakes with Creamy Grape Buttercream
These grape soda cupcakes are light, fluffy, and infused with real grape soda flavor—no artificial aftertaste. The carbonation helps create a tender crumb, while a silky grape buttercream on top gives them a nostalgic soda-shop vibe that’s perfect for birthdays, bake sales, or fun retro desserts.
Servings 12 cupcakes
Calories 310kcal
Cost $7 for entire recipe
Equipment
- Standard 12-cup muffin pan
- Cupcake liners
- Mixing bowls (medium & large)
- Hand mixer or stand mixer
- Measuring cups and measuring spoons
- Rubber spatula
- wire cooling rack
- Piping bag with tip (optional, for frosting)
Ingredients
Cupcakes
- 1 ½ cups all-purpose flour
- 1 ½ tsp baking powder
- ¼ tsp salt
- ½ cup unsalted butter softened
- ¾ cup granulated sugar
- 2 large eggs room temperature
- ½ cup grape soda not diet
- 1 tsp vanilla extract
- Optional: purple gel food coloring
Grape Buttercream
- 1 cup unsalted butter softened
- 3–3½ cups powdered sugar
- 3 tbsp grape soda
- 1 tsp grape extract
- Pinch of salt
- Optional: purple gel food coloring
Instructions
Make the Cupcakes
- Preheat oven to 350°F (175°C) and line a muffin pan with liners.
- Whisk flour, baking powder, and salt in a bowl.
- Cream butter and sugar until light and fluffy (2–3 minutes).
- Beat in eggs one at a time, then add vanilla.
- Alternate adding dry ingredients and grape soda, beginning and ending with dry. Mix just until combined.
- Add food coloring if using.
- Fill liners ⅔ full and bake 18–20 minutes, until a toothpick comes out clean.
- Cool completely before frosting.
Make the Buttercream
- Beat butter until smooth and creamy.
- Add powdered sugar gradually.
- Mix in grape soda, grape extract, and salt.
- Beat until fluffy (2–3 minutes). Add food coloring if desired.
- Frost cooled cupcakes.
Notes
- Use non-diet grape soda only. Diet soda will not provide enough sugar or structure and can cause the cupcakes to collapse.
- Do not overmix after adding the soda. Carbonation helps create a light crumb, but overmixing will deflate the batter and make the cupcakes dense.
- Grape extract is key for flavor. Soda alone gives sweetness but not enough grape depth. Start with 1 teaspoon and adjust to taste.
- Food coloring is optional. The cupcakes bake up light in color; use purple gel coloring if you want a vibrant soda-shop look.
- Cool completely before frosting. Even slight warmth will melt the buttercream and ruin piping definition.
- For stronger grape flavor, brush cooled cupcakes lightly with 1–2 teaspoons of grape soda before frosting.
- Buttercream consistency tip: If frosting is too soft, chill for 10–15 minutes. If too stiff, add ½–1 teaspoon grape soda.
- Storage: Store frosted cupcakes in an airtight container at room temperature for 1 day or refrigerated for up to 4 days.
- Freezing: Unfrosted cupcakes freeze well for up to 2 months. Thaw fully before decorating.
- High-altitude baking: Reduce baking powder by ¼ teaspoon and check for doneness 2 minutes early.