Preheat the oven to 350°F (177°C). Line a 12-cup muffin pan with cupcake liners. This recipes yields about 15 cupcakes, so you’ll have a 2nd batch.

Whisk the flour, baking powder, and salt together in a large bowl. Set aside.

Using a handheld or stand mixer fitted with a paddle attachment, beat the butter, sugar, and lemon zest together on medium-high speed in a large bowl until creamed, about 3 minutes. Scrape down the sides and bottom of the bowl as needed. (Here’s a helpful tutorial if you need guidance on how to cream butter and sugar.) Add eggs and vanilla extract, and then beat on medium-high speed until combined, about 1 minute. Scrape down the sides and bottom of the bowl as needed. Add the dry ingredients and then turn the mixer on low speed and slowly pour in the milk and lemon juice. Beat until just combined. Fold in the floured blueberries. Do not overmix.

Pour/spoon the batter into the liners—fill only 2/3 full to avoid spilling over the sides. Bake for 18–21 minutes, or until a toothpick inserted in the center comes out clean. For around 30–36 mini cupcakes, bake for about 11–13 minutes, same oven temperature. Allow the cupcakes to cool completely before frosting.

In a large bowl using a handheld or stand mixer fitted with a whisk or paddle attachment, beat the cream cheese and butter together on medium speed until smooth, about 2 minutes. Add confectioners’ sugar, vanilla extract, and salt and beat on low speed for 30 seconds, then turn the mixer up to medium-high speed and beat for 2 full minutes. Taste and add an extra pinch of salt if desired. If you plan to frost intricate designs with this frosting, refrigerate it for at least 20 minutes first.

Frost cooled cupcakes and top with optional garnish, if desired. I used Ateco #808 piping tip in the pictured cupcakes. You could also use a small icing spatula. Refrigerate decorated cupcakes uncovered for at least 20 minutes to help set the frosting before serving.

Cover and store leftover cupcakes in the refrigerator for up to 5 days. A cupcake carrier makes storing and transporting easy.