[**EDIT] I just tried making these with demerara brown sugar and 'Best For Bread' flour and they came out PERFECT. Like, I don't think I can ever go back. Perfect thickness, perfect texture, perfect colour. Photos soon.
So I FINALLY found a chocolate chip cookie recipe that I like. It's literally taken years.
2 sticks (1 cup) unsalted butter at room temperature
1 1/4 cups brown sugar
3/4 cup granulated sugar
2 eggs, one at a time
1 tbs vanilla
3 cups of flour
1 tsp baking soda
1 tsp baking powder
1/2 tsp salt
Slowly add dry to wet (I did it in four installments).
Mix in 1 1/2 cups chocolate chips.
Bake at 375F for 8 - 9 minutes for chewy fantasticness. Makes about 35 cookies.