First, preheat the oven to 350 degrees F. and line a cookie sheet with parchment paper.
Second, cream the sugar, butter, eggs, and vanilla extract in a large bowl.
Third, combine the baking powder, baking soda, flour, and salt in a separate bowl.
Next, add the wet ingredients to the dry ingredients and mix until cookie dough forms.
Then, add the milk chocolate and semi-sweet chocolate chips to the dough and incorporate them.
Using an ice cream scoop, measure the cookies and place them on the parchment paper-lined cookie sheet.
Pop the cookies into the freezer for 15 minutes to let the dough set.
Next, bake the cookies in batches on the parchment paper-lined cookie sheet. Remember that these cookies are BIG and FLAT, so you must space them accordingly.
Then, bake the cookies for about 18 minutes. They will become slightly golden brown. Tap them down to flatten before you pull them out of the oven.
Finally, serve these delicious cookies with ice-cold milk or ice cream, and enjoy!