Preheat oven to 350F. cover a 9x13 baking dish with foil and spray with cooking spray
In a small bowl, combine the ingredients for the sauce. Mix together and set aside
In a large skillet over medium heat, sauté chopped onions and add "ground beef" season with salt and pepper to taste cook "meat" according to package directions turn stove off when done
Place the bottoms of the slider buns in the prepared dish or sheet pan.
Spread a thin layer of the big mac sauce on the bottom buns
top with lettuce onion and cheese and pickles
Place top buns on the sliders. brush the top of buns with melted butter I seasoned my melted butter with garlic powder.
cover with foil and cook in oven for about 10 minutes until cheese melts. serve and enjoy!