In a large mixing bowl, using an electric hand mixer with beaters attached, beat white sugar, brown sugar, and butter together until fluffy.
Add egg and vanilla. Beat until smooth.
To the bowl, add flour, baking powder, baking soda, and salt. Beat until well-mix.
Stir in chocolate chips. (Dough will be a bit crumbly but should come together when worked into a ball.)
Make balls of dough using a ¼ cup measuring cup and place them on a greased baking sheet.
Place baking sheet in the refrigerator for 30 minutes.
Preheat oven to 350°F.
Bake cookies for 15 minutes or until the middle is set and edges begin to brown.
Remove from the oven and let cool slightly on a wire cooling rack.
Serve and enjoy.