Rainbow Chip Oatmeal Bars

3 sticks of butter1 1/4 cups packed brown sugar (preferably organic brown sugar) 1 cup regular sugar 2 eggs 1 tablespoon vanilla extract3 3/4 cups flour 1 cup quick-cooking oats 2 teaspoons baking soda 1 teaspoon salt (preferably kosher salt) 1 bag (12 ounces) M&M?s mini baking bitsHeat oven to 350 degrees.Cream butter and sugars until light and fluffy. Add egg and vanilla extract and combine.In separate bowl, combine flour, oats, baking soda and salt. Add to creamed mixture and combine. Add baking bits or chocolate chips and mix through dough.Spread dough onto an ungreased 11-by-17-inch baking pan; bake 25-30 minutes, or until light golden-brown and firm. Cool in pan; when cool, cut into 32 squares.Serves 32.