Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.
In a large mixing bowl, combine the flour, granulated sugar, brown sugar, baking powder, baking soda, and salt.
In another bowl, whisk together the egg, milk, vegetable oil, and vanilla extract.
Pour the wet ingredients into the dry ingredients and stir until just combined.
Fold in the chocolate chips gently.
Fill each muffin cup about ¾ full with the batter.
Bake in the preheated oven for 18-22 minutes, or until a toothpick comes out clean.
Allow the muffins to cool in the pan for 5 minutes, then transfer to a wire rack.
Enjoy warm or store for later.