In a separate large mixing bowl, use a hand mixer to beat the butter, vegetable oil, and granulated sugar until smooth and light.
4 tablespoons unsalted butter, ¼ cup vegetable oil, ¾ cup granulated sugar
Add the eggs, sour cream, and vanilla extract. Mix until combined.
2 large eggs, ⅓ cup sour cream, 1 teaspoon vanilla extract
Add the dry mixture, alternating with the matcha milk, until completely combined.
Fill each cupcake liner about ⅔ full.
Bake for 16-18 minutes or until a toothpick inserted into the center comes out clean.
Allow the cupcakes to cool completely before frosting.
For the buttercream
Beat the softened butter and vanilla extract until smooth and creamy.
1 cup butter, 1 teaspoon vanilla extract
Gradually add the powdered sugar and beat until completely combined.
3 cups powdered sugar
Transfer the buttercream to a piping bag fitted with a round tip.
Pipe the buttercream onto the cooled cupcakes.
Sift the matcha powder over the top.
1 tablespoon matcha powder
Notes
🥡 Storage
Keep leftover cupcakes covered to protect them from drying out.
If presentation matters, add the final dusting of matcha closer to serving.
♨️ Reheating
Reheating is not recommended for these cupcakes. They are best enjoyed at room temperature.
❄️ Freezing
For easiest freezing, freeze the cupcakes before frosting. Cool them completely, wrap well, and place them in a freezer-safe container. Thaw before decorating.
💡 Tips for Best Results
Whisk the matcha thoroughly into the warm milk so there are no large clumps.
Do not overmix the batter after adding the flour.
Let the cupcakes cool completely before piping on the buttercream.
🍳 Alternate Cooking Methods
No alternate cooking method is recommended. Baking these cupcakes in a standard oven gives you the most predictable and even results.
♻️ Leftovers
Leftover cupcakes make an easy dessert or sweet snack.
If the matcha topping has absorbed into the buttercream, you can add another light dusting before serving.
📝 Notes
A milk frother works especially well for combining the matcha powder and warm milk. If you don't have one, use a small whisk and mix thoroughly.
For the brightest-looking topping, sift the matcha over the buttercream shortly before serving.