M&M Brownie Bars

1 (21 to 23 ounce) package fudge brownie mix
1 cup chopped nuts
3/4 cup quick oats
1/2 cup brown sugar
1/2 cup coconut
1/3 cup melted butter or margarine
1 cup plain M&M's

Prepare brownie mix according to package for cake-like brownies; spread batter into greased 15 1/2 x 10 1/2-inch jellyroll pan. Combine nuts, oats, sugar, coconut and butter. Mix well. Sprinkle evenly over brownie mixture. Sprinkle top with 1 cup candies. Bake at 350 degrees F for 30 to 35 minutes.