Cupcakes

Preheat the oven to 350 degrees. Put the cupcake liners in the pan.

Add salt, baking powder, and 1 cup of the flour into the bowl and mix.

Add blueberries to a different bowl and sprinkle in 1/4 cup of flour. Mix gently. set aside.

Use a mixer and combine butter and sugar until fluffy.

Add sour cream, eggs, and extract to the mixed butter mixture. Combine. Add in the dry mixture and mix.

Fold in blueberries and fill cupcake liners about 3/4 full. Put in the oven and bake for 15-20 minutes.

Let cool in the pan for 15 minutes then move to a cooling rack.

Lemon Filling

In a saucepan, mix the lemon juice, butter, and lemon zest. Add in sugar and mix. Add in eggs and mix.

Cook over medium-low heat stirring often. The mixture should thicken and coat the back of a spoon.

Take off heat and let cool entirely.

Icing

Add butter and extract in a bowl until creamy. Mix in powdered sugar.

To make cupcakes

Use an apple corer or a spoon and cut out a small hole. Add in the lemon filling.

Pipe icing onto the cupcake.

Top with blueberries.