Preheat oven to 400˚F. Spray a large. baking dish with nonstick spray.
Slice slider buns in half and lay the bottom half in the baking dish. Spread half the mustard (about 2 tablespoons) on the bottom half of the slider buns.
Top with sliced ham. You can use multiple varieties or all the same.
Top ham with sliced Swiss cheese.
Add sliced pickles to the ham and drizzle with mustard. Place the top half of the slider buns on and spray the top of the buns with very lightly with nonstick spray.
Place a piece of foil over the top of the sliders and use a second dish to press down on the sliders.
Bake the sliders at 400˚F while they are being pressed for 20 minutes.
Remove the press pan and the foil and return to the oven for an additional 5-10 minutes to crisp up the top of the sliders and melt the cheese.