Add 2 T. olive oil to a medium-sized pan and bring to medium-high heat.

Sauté onions until slightly caramelized and tender, about 6 to 8 minutes.

Add mushrooms and a pinch of salt and pepper to sauté pan. Sauté mushrooms until tender, about 4 to 5 minutes; season to taste and set aside.

In a large pan add remaining 1 T. oil, and season both sides of burger slider patties, sear on both sides about 3 to 4 mins per side.

Place a spoonful of mushrooms and onions on top of each burger, and top with a provolone cheese slice.

Place water in pan and cover the pan; steaming for about 45 seconds to 1 minute until cheese melts.

Meanwhile, toast slider buns cut side down in a large pan with unsalted butter. When toasted, remove and set aside.

Place all ingredients in a small bowl and whisk until well incorporated. Season to taste with salt and pepper.

Bring heavy cream to a boil in small saucepan and whisk in cheese and garlic powder. Reduce to a simmer for about 6 to 8 minutes until thickened and sauce-like. Season to taste with salt and pepper.

Spread sriracha mayonnaise (recipe below) on bottom of toasted buns. Place slider on bun and top with provolone cheese sauce (recipe below). Place top bun on slider and enjoy!