Blueberry Cupcakes with Brown Sugar Buttercream - Cupcake Fanatic

Ingredients

• 2 cups blueberries
• 1/4 cup sugar
• 1 tbsp cornstarch
• 1/2 cup (1 stick) unsalted butter, softened
• 1/2 cup sugar
• 1/2 cup brown sugar, packed
• 2 eggs
• 2 tsp vanilla extract
• 1-3/4 cups flour
• 2 tsp baking soda
• 1 tsp baking powder
• 1/4 tsp salt
• 3/4 cup milk
• 1/2 cup blueberries
• 1 cup (2 sticks) unsalted butter, softened
• 1/3 cup brown sugar, packed
• 1 tsp vanilla extract
• 3 cups powdered sugar