Disposable muffin tins Cupcake liners 1/2 cup butter or one stick 1 cup granulated sugar 3 large eggs added one at a time 2 cups all purpose flour Mixing bowls Mixer with paddle attachments 1 tsp baking powder 1 tsp baking soda 1/2 tsp salt 1 cup sour cream 1 tsp vanilla 2 cups blueberries tossed in 1 tbsp flour and sugar

Heat oven to 350 f or 180 c
Cream together butter and sugar
Add eggs one at a time
Mix dry ingredients with egg mixture
Add sour cream, blueberries and vanilla to mix mix well
Fill muffin tins 2/3 full
Top with 1/2 cup sugar
1/2 cup flour
4 tbsp butter
1/2 tsp cinnamon
Bake 350 30 minutes