Preheat over to 400 degrees Fahrenheit. Place 12 muffin/cupcake liners in a muffin pan or spray with non-stick cooking spray.
In a very large bowl, combine flour, sugars, baking powder, and salt.
In a large bowl, mix together melted butter, eggs, milk, and vanilla until combined well.
Pour the liquid ingredients into the large bowl with the dry ingredients. Mix until ingredients are just combined. Do not over mix. Gently stir in chocolate chips.
Fill muffin cups with batter so they are ⅔ full. Bake for 12-14 minutes or until they start to brown.
Let cool in pan for a few minutes and then remove muffins from pan and place on a wire cooling rack.
To freeze - place 12 muffins in a gallon-size freezer bag. Be sure to label and date your bag before you place it in the freezer. To thaw - remove from freezer the night before you plan on eating them. Pop one in the microwave for 15-20 seconds and enjoy your homemade chocolate chip muffins.