Step 1

Heat oven or toaster oven to 350°F.

Step 2

Beat butter and sugars together in small bowl until creamy. Add egg yolk and vanilla; beat until well mixed.

Step 3

Combine flour, baking soda and salt in another small bowl. Add flour mixture and chocolate chips to butter mixture. Stir, by hand, until combined.

Step 4

Drop dough by rounded tablespoonfuls, 2 inches apart, onto ungreased cookie sheet. Bake 9-11 minutes or until edges are light golden brown.