Chocolate Cupcakes & Butter Cream Frosting

Dry ingredients:
•1 cup all-purpose flour 
•1/3 cup cocoa powder
•1/4 teaspoon baking powder
•3/4 teaspoon baking soda
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​Wet ingredients:
•7 tablespoons soften butter
•1 egg
•warm milk half cup
•1 teaspoon vanilla extract