Heat the oven to 350°F.

Spray a 13 X 9 cooking pan with cooking spray and place the bottoms of the buns in the pan.

Note: some buns will need to be cut.

Mix the Dijon mustard, Worcestershire sauce, and onion powder in a small bowl. Spread the mix on the bottoms of the buns.

Place a slice of ham on each bun, then place the Havarti cheese on top side by side to cover the ham. Place a pickle on each bun.

Mix the mayonnaise and yellow mustard in a small bowl and spread the mix on the inside of the bun tops. Place the tops on the sandwiches.

Melt the butter and spread it on the tips using a basting brush. Sprinkle some poppy seeds and sesame seeds on the tops.

Place in the oven for 10 minutes. After removing the sliders from the oven, use a knife to cut the sliders apart.