White Chocolate Caramel Layer Bars

These bars are fairly quick to make despite the extra step of baking the base before adding the caramel layer. They're very sweet and would also be good with dark chocolate chips instead of white.

Ingredients
1 3/4 cups all-purpose flour
2 teaspoons cornstarch
1/2 teaspoon baking powder
1/2 teaspoon salt
1/2 cup margarine, at room temperature
1 cup brown sugar
1 large egg
15 caramel squares, melted
1/2 cup white chocolate chips

Instructions
Preheat oven to 350 degrees. Spray a loaf pan with cooking spray.
In a small bowl, mix together flour, cornstarch, baking powder, and salt. Set aside.
In another bowl, cream together the margarine and brown sugar. Add in the egg.
Gradually add in the flour mixture.
Press half of the dough into the bottom of the loaf pan. Bake for 8 minutes. While the base is baking, stir in the white chocolate chips to the remaining dough. 
Remove the base from the oven. Pour in the melted caramel. Press the remaining dough on top. Put the pan back into the oven and bake for another 8 minutes until golden.
Cool completely before cutting into bars.
Yields 12 pieces.