Chocolate Chip Peanut Butter Shortbread Cookie Bars

INGREDIENTS

3 1/2 sticks

margarine, at room temperature* see notes

3 cups

powdered confectioner's sugar

1 cup

creamy peanut butter

1 tbsp

pure vanilla extract

1/4 tsp

almond extract, optional to taste

3 cups

all-purpose flour

3 tbsp

cornstarch

1/8 tsp

salt

2 tbsp

milk or water

11 1/2 oz

semi sweet chocolate chips

7 oz

peanut butter baking chips

1/2 cup

chopped pecans, optional