Nutty Chocolate Chip Picnic Cake

1/2 cup miniature semisweet chocolate chips
1/3 cup packed brown sugar
1/3 cup chopped pecans
1 box Betty Crocker® SuperMoist® devil's food cake mix
Water, vegetable oil and eggs called for on cake mix box

1. Heat oven to 350°F (325°F for dark or nonstick pan). Mix chocolate chips, brown sugar and pecans; set aside.
2. Make and cool cake as directed on box for 13x9-inch pan--except sprinkle chocolate chip mixture on batter in pan before baking.
3. Store tightly covered.