Preheat oven to 350F. Line a 12 cup muffin tin with paper or aluminum foil liners.

In a large bowl, beat together sugar & egg until light and fluffy.

In a small bowl, whisk together flour, baking powder, & salt. Pour into egg mixture and stir to combine. Pour in vegetable oil, milk & vanilla extract.

Divide batter evenly into 10 muffin cups, filling each about ¾ full.

Bake for 15-18 minutes, until a tester inserted into the center comes out clean.

While muffins are baking, melt butter & mix together with cinnamon. Pour colored sugar into a small bowl. When muffins are done, brush the top of each with the melted butter mixture then remove from the pan and roll or sprinkle with sugar. Cool on a wire rack before serving.