White Chocolate Strawberry Cupcakes

and 3/4 cups (200g) cake flour (spoon & leveled)

baking powder

baking soda

salt

unsalted butter, softened to room temperature

granulated sugar

egg whites, at room temperature

sour cream or plain yogurt, at room temperature

and 1/2 teaspoons pure vanilla extract

whole milk, at room temperature

cup reduced strawberry puree (see note)*

white chocolate, melted and slightly cooled (see note)*

optional: fresh strawberries coated with 2 ounces melted white chocolate