Combine flour, baking powder, baking soda, cocoa powder and salt in a bowl. Whisk to combine until no lumps remain.
1 ¾ cups flour, 2 teaspoon baking powder, ½ teaspoon baking soda, 1/3 cup cocoa powder, ½ teaspoon salt
Whisk egg, milk, canola oil and sugar in a mixing bowl. Add in flour mixture and whisk until no lumps remain.
1 egg, 1 cup milk, 2/3 cup canola oil, ¾ cup sugar
Stir in 1 cup of the chocolate chips. Scoop the batter evenly into 12 cupcake liners. Top with remaining chocolate chips and course sugar. Bake for 20 minutes, rotating halfway through. Muffins are done when they spring back after being lightly pressed.