Making shortbread

Today I made shortbread. It was very fun and easy.
Here is the recipe:
Beat together:
10 tablespoons
(1 1/4 sticks) unsalted butter, softened
1 /4 cup powdered sugar
1 1/2 tablespoons sugar
1/4 teaspoon salt
stir in:
1 1/2 cups all-purpose flour
Knead a few times. Press into an 8X8 pan. Prick all over. Bake at 300 degrees then put chocolate chips on it.