1-1/2 cups cubed fully cooked ham (about 8 ounces)
1/4 teaspoon pepper
Preheat oven to 425°. Cook broccoli and cauliflower according to package directions; drain.
Meanwhile, in a small skillet, melt 2 teaspoons butter. Add bread crumbs; cook and stir over medium heat until lightly toasted, 2-3 minutes. Remove from heat.
In a large saucepan, melt remaining butter over medium heat. Stir in flour until smooth; gradually whisk in milk. Bring to a boil, stirring constantly; cook and stir until thickened, 1-2 minutes. Remove from heat; stir in cheeses until blended. Stir in ham, pepper and vegetables.
Transfer to a greased 8-in. square baking dish. Sprinkle with toasted crumbs. Bake, uncovered, until heated through, 10-15 minutes.