Make spicy mayo by combining 1/2 cup mayo and 1 tablespoon El Yucateco® Red Chile Habanero sauce. Set aside in fridge until ready to use.
Place beer bratwurst and ground chuck in large bowl top. Add El Yucateco® Red Chile Habanero, 1 tablespoon El Yucateco® Chipotle and 2 tablespoons minced onions.
Use hands to combine evenly but do not over handle.
Spread remaining onions evenly on a large cookie sheet or half sheet pan.
Evenly spread and press down meat mixture over onions. (This can be prepared ahead of time. Cover with plastic wrap and store in the refrigerator for up to 24 hours.)
Cook sliders in preheated oven for 25 minutes. Meat will shrink up.
Remove from oven and drain excess grease.
Cover meat with cheese and placer back in oven until cheese melts.