Festive Holiday Broccoli-and-Cauliflower Gratin

Broccoli Cauliflower Gratin

32 ounces fresh broccoli and cauliflower flowerets
1 1/2 cups mayonnaise
1 cup (4 ounces) shredded Cheddar cheese
1/2 cup shredded Parmesan cheese
4 green onions, sliced
2 Tbsps. Dijon mustard
1/4 tsp. ground red pepper
3 Tbsps. Italian-seasoned breadcrumbs

Arrange flowerets in a steamer basket over boiling water. Cover and steam for 6 to 8 minutes or until crisp-tender. Drain well. Arrange flowerets in a lightly greased 2-quart baking dish. Stir together mayonnaise and next 5 ingredients. Spoon over flowerets. Sprinkle with breadcrumbs. Bake at 350° for 20 to 25 minutes or until golden.

Recipe from SouthernLiving.com