Mushroom Swiss Burger Sliders

Cooking

• Preheat oven to 400°F.
• Melt 4 tablespoons butter in a small microwaveable bowl. Add the Dijon mustard. Mix well and let cool. While continuing with the recipe, stir every few minutes while it cools to keep mustard and butter incorporated.
• Spread out the ground beef evenly onto a 13x18 rimmed sheet pan, attempting to cover the entire pan. Sprinkle with salt and pepper, or additional seasonings of choice. Bake for 15-20 minutes, until internal temperature reaches 155°F on a meat thermometer.
• Meanwhile, melt remaining 1 tablespoon butter in a skillet over medium-high heat. Add sliced mushrooms and sauté until mushrooms are tender. Set aside.
• When ground beef is cooked, remove from the oven and carefully pour off fat. Using a pizza cutter or sharp knife, cut the cooked beef into 12 even squares.
• Cut or separate top and bottom of slider buns. Place 12 bottom buns in a lightly greased 13x9 baking pan. Spread half of the cooled butter-mustard mixture on the bottom buns with a small rubber spatula or butter knife.
• Place one square of beef onto each bottom bun. Top beef with slices of swiss cheese. Place the pan back in the oven for a few minutes just to melt the cheese.
• Meanwhile, spread the remaining butter-mustard mixture on the 12 top buns.
• Remove sliders from the oven and divide the cooked mushrooms evenly over the top of the melted cheese. Place the top buns over the mushrooms.
• If desired, spray the top of the buns with a bit of spray butter or nonstick spray and sprinkle with sesame seeds.
• Return the completed sliders to the oven for an additional few minutes to toast the top bun. Serve hot.