Mushroom-Swiss Sliders

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I'm a big fan of the Pioneer Woman's food - I've yet to try something I didn't care for. When I was looking for a great slider for our Super Bowl get together, I checked her site and thought these looked delicious.

Overall, I thought it was very good. Looking back, I should have used my castiron skillet to get that extra flavor in the patty. Because I didn't have a lid for the skillet I used, my cheese didn't get as bubbly and melty as hers did. We also didn't toast our buns and I would do that next time. Still tasty, though.

Mushroom and Swiss Sliders
⅓ cups Mayonnaise
2 Tablespoons Ketchup
1 teaspoon Cayenne Pepper
4 Tablespoons Butter
½ whole Medium Onion, Finely Diced
8 ounces, weight White Mushrooms, Chopped Finely
½ cups White Or Red Wine (optional)
4 dashes Worcestershire Sauce
Kosher Salt And Freshly Ground Black Pepper
2 pounds Ground Beef
4 Tablespoons Heavy Whipping Cream (I would skip next time - didn't make much difference)
4 dashes Worcestershire Sauce
1 teaspoon Kosher Salt
Freshly Ground Black Pepper
4 slices Swiss Cheese, Cut Into Four Squares
8 whole Dinner (or Slider) Rolls, Split

In a small bowl, mix mayonnaise, ketchup, and cayenne. Stir together until totally combined. Set aside. (This is the spicy fry sauce.)

Melt butter in a large skillet. Add onions and cook over medium heat for five minutes, stirring frequently. Add mushrooms and toss around, then add wine (if using), Worcestershire, salt and pepper. Cook for several minutes over medium heat, or until all liquid has evaporated. Transfer mushroom mixture to a separate bowl, scraping all contents from the skillet.

Mix ground beef, heavy cream, Worcestershire, and salt and pepper in a bowl. Use your hands to thoroughly mix ingredients. Form 1/4 to 1/3 cup of the meat mixture into patties, making an indentation with your thumb to keep the patties from plumping too much when they cook. In the same skillet as the one used to cook the mushrooms, melt 1 tablespoon butter over medium to medium-high heat. Add four patties at a time, indented side face up. Cook for 4 minutes, then flip. Spoon generous portion of mushroom mixture on each patty, then top with one or two squares of Swiss, depending on your preference. Place lid on skillet and cook for an additional 2 to 3 minutes, until burgers are cooked through and cheese is melted. Remove to a place and keep warm while you repeat with the rest of the meat mixture.

Toast halved buns under the oven broiler. Spread generously with spicy fry sauce. Place patties between buns and serve immediately

Original recipe here.