The problem could be with your oven temperature. Buy an oven thermometer and check. Could also be your baking soda or baking powder. If it's too old, your
cookies won't rise. This recipe bakes thick, tender cookies. A secret to tender cookies is when mixing in the flour, mix only until combined or else you will toughen the cookie. Enjoy !

1 cup butter, softened but not liquid
3/4 cup granulated sugar
3/4 cup packed brown sugar
1 egg, room temp
2 1/4 cup all purpose flour
1 tsp. baking soda
1/2 tsp. salt
1 cup coarsely chopped nuts, optional
1 pgke. (12 oz.) semisweet chocolate chips

Mix butter, sugars & egg. Combine flour, soda & salt. Stir in. (dough will be stiff). Stir in nuts & chips. Drop by rounded teaspoonfuls onto ungreased cookie sheets. Bake at 375 degrees for 8-10 mins until light brown. (center will be soft). Cool slightly & remove from sheet. Makes about 6 dozen cookies. 90 calories per cookie.