GREASE bottom of a 13x9x2-inch baking pan.
PREPARE brownie mix according to package directions; SPOON into pan.
COMBINE pecans, oats and brown sugar; STIR in melted butter; STIR in M&M's.
SPRINKLE over batter.
BAKE at 350 F for 20-25 minutes.
Let COOL; CUT into squares.
Per Serving (excluding unknown items): 97 Calories; 6g Fat (50.8% calories from fat); 1g Protein; 11g Carbohydrate; 1g Dietary Fiber; 5mg Cholesterol; 20mg Sodium. Exchanges: 0 Grain(Starch); 0 Lean Meat; 1 Fat; 1/2 Other Carbohydrates.