Lightly coat two 13x9x2-inch baking pans with nonstick cooking spray; set aside. In a small bowl combine 1/4 cup melted butter, the flour and the jam, breaking up any large pieces of fruit; set aside.Advertisement
Cut rolls in half horizontally. Lay roll bottoms, cut sides up, in an even layer in prepared pans. Spread each roll bottom with 1 teaspoon of jam mixture. Divide ham and cheese evenly among the roll bottoms (about 1 ounce ham and 1/2 ounce cheese per sandwich). Add roll tops.
For topping: In a small saucepan, melt the 1/2 cup butter over medium heat. Remove from heat; stir in brown sugar, mustard and Worcestershire sauce. Using a pastry brush, coat roll tops with topping. Sprinkle roll tops with poppy seeds.
Bake sliders in a 350°F oven for 20 minutes or until cheese is melted and sliders are heated through.
Once sliders have been assembled, but before topping is made, cover tightly with plastic wrap and refrigerate up to 24 hours. Just before baking, prepare topping. Brush and bake as above.