Mix 2 cups pancake mix (boxed), 1 cup milk, and 1/4 cup brown sugar together in large bowl.
Place mix to the side.
Mix 1 1/2 cups powdered sugar, 1/2 cup milk, 2 teaspoons cinnamon, 1 tablespoon brown sugar, and 5 teaspoons butter (melted) in mug ad pour mixture into a small baggie for later.
Mix 1 1/2 cups powdered sugar, 1/2 cup milk together in small or medium mug and set aside for drizzle later over pancakes.
Put pancake mix into buttered pan. cut a small whole into cinnamon glaze baggie and swirl into uncooked face up side of pancake. Flip as usual and finish cooking other side. Continue with the rest of the batter the same way. Once finished with the pancakes drizzle glaze over pancakes and serve.
