Cream butter and sugars for 5 mins on medium speed.

Combine flour, baking powder salt and cornstarch in a bowl.

Add vanilla and one egg at a time to the butter and mix well.

Slowly mix the flour mixture into the butter mixture on the lowest speed until just combined.

Add chips and nuts of your choice. Fold them in.

Refrigerate for 1 hour or more. 2 hours works well. Let it sit at room temperature for 5-10 mins before baking.

Drop 2 tablespoon balls onto parchment lined baking sheet.
Press the cookies down lighty.

Bake at 350 for 10-15 minutes until light brown.

Cool on a rack. Enjoy.