- Place 1 cup semi-sweet chocolate finely chopped (or chips) in microwave safe measuring cup and add in 2 tablespoons butter. Heat for 45 seconds, then remove and stir. If chocolate is not all melted, return to microwave for 10 second increments until fully melted. 
- Sift flours, baking soda, baking powder and salt into a bowl and set aside. 
- Using a mixer with a paddle attachment, cream room temperature butter and sugars until light and fluffy – about 5 minutes. Add eggs one at a time. 
- Slowly add in melted (and slightly cooled) chocolate and vanilla. 
- With mixer on low speed, add dry ingredients slowly, mixing until just combined. Fold in chocolate chips. 
- Refrigerate dough for 24-36 hours. (Do not skip this step!) 
- When ready to bake, preheat oven to 350. (325 convection) 
- Drop spoonfuls of dough onto baking sheet. Bake for 10-12 minutes. Do not over bake. Slightly gooey centers is the best way to eat!