Start by sifting the flour, matcha, baking powder, baking soda, and table salt together. Set aside.
In a large bowl, add eggs, whisk for 30 seconds. Add oil, whisk for another 30-45 seconds, until well incorporated.
Pre-heat the oven to 350F.
Prepare a cupcake pan with 12 cupcake liners, or butter and flour the cupcake cavities.
Add the sugar to the egg/oil mixture. Whisk for one minute, until incorporated.
Add vanilla extract. Mix to combine.
Add half of the flour mixture, folding slowly with the spatula.
Add the buttermilk and fold again. If you notice too many lumps, use a whisk to make the batter smooth, just be careful not to overmix or over whisk the batter, because that might result in a dry and tough cupcake.
At last, add the remaining flour. Fold until just incorporated.
Divide batter evenly between the cupcake cavities, filling each one up to about 3/4 of the capacity.
Bake in pre-heated oven for 10-12 minutes, until cupcakes look slightly golden on top, and a toothpick comes out clean when inserted in the cupcakes. Or you could also test it by gently touching the top of a cupcake with your finger, if the cupcake springs back, means it’s already baked. Be careful not to overbake your cupcakes, or they will be tough and dry when they cool down.
Set them aside to cool.
Blueberry Buttercream Frosting
For this Blueberry Buttercream Frosting, first make the blueberry jam and set it aside to cool completely in the fridge.
If you would like to use store-bought jam, that’s fine, but I cannot guarantee that the buttercream will be the same, because of how sweet your jam is, or if it’s been strained or not, and etc. So, just keep that in mind if you choose not to use this Blueberry Jam recipe I have below. Again, it’s totally fine if you don’t, but be aware of the different results you might obtain.
Start by creaming the butter in the bowl of a stand mixer, a hand mixer will work fine as well.
Cream butter for about 2 minutes.
With the mixer off, add powdered sugar in. Stir the mixture in the lowest setting, until the sugar is incorporated.
Then, turn speed to medium high and cream buttercream for about 1-2 more minutes, until fluffy.
Add vanilla and jam to the bowl, mix on low until incorporated. Raise speed to medium high and cream for 30 seconds or so. Make sure to scrape the bowl and turn the mixer on again, until the frosting is smooth.
If you find that your buttercream is too runny, not solid enough, first check the temperature of your butter. Make sure not to use butter that’s too soft. The butter should be just at room temperature. If your butter temperature isn’t the problem, then add some more sifted powdered sugar, by the tablespoons, mixing until you achieve the desired consistency.
Alternatively, if the buttercream seems too dry and stiff, add one more tablespoon of jam (or milk, or any other liquid) at a time, until you reach the desired consistency.
Blueberry Jam
Mix blueberries and maple syrup in a small saucepan.
Bring it to a boil over medium high heat.
Reduce heat to medium low, once it reaches a boil.
Start to press down on blueberries and stir the mixture frequently as it cooks.
Mix water and cornstarch in a small bowl. Set aside.
Once the mixture has cooked for about 5 minutes, add cornstarch and water mixture.
Stir constantly as it cooks for another 2 minutes or until thickened.
Pour mixture into a bowl, through a fine mesh sieve, stir vigorously to be able to extract all of the juice from the jam.
When it doesn’t seem like there’s any more juice left, only pulp, discard the pulp. Let jam cool down. Refrigerate until completely cold.
To assemble
Put frosting in a piping bag lined with tip of choice. Frost cupcakes. Place a matcha macaron on top of cupcakes.
Storage
Cupcakes will keep well in the fridge for 3 days, if covered.