2/3 c. soft butter or shortening
1/2 c. sugar
1/2 c. brown sugar
1 egg
1 tsp. vanilla
1 1/2 to 1 1/3 c. flour
1/2 tsp. baking soda
1/2 tsp. salt
2 tbsp. water
6 oz. M&M'S®

Mix butter, sugar, brown sugar, egg, and vanilla. Stir in flour (use 1 1/3 cups for more rounder cookie), soda, salt plus water. Add M&M'S®. Bake at 375 degrees for 8-10 minutes on ungreased sheet.