Party Ham Sandwiches

2 pkg (17 oz each) attached baked dinner rolls (24 rolls), cut in half
1/2 cup mayo
2 pkg (6 oz each) Oscar Mayer Deli Fresh shaved smoked ham
1 pkg (8 oz) cracker Barrel Cracker Cuts 2% Extra Sharp Cheddar
1/2 small red onion, cut into 24 thin slices
2 tbsp butter, melted
1 tbsp dijon mustard
1 tsp poppy seeds

Heat oven to 350. Place bottom halves of rolls in 15x10x1 inch pan; spread with mayo. Top with ham, cheese, onions, and tops of rolls. Mix remaining ingredients; brush onto sandwiches. Cover with foil.Bake 20 minutes or til heated through.