Ingredients
6 frozen beef burger patties (about 1/3 lb each, 80–85% lean)

Directions
Place your slow cooker on a stable surface, like a brown woodgrain laminate countertop, and set it to the Low setting. Lightly spray the inside of the slow cooker with nonstick cooking spray for easier cleanup, if you like.
Scatter the sliced onion evenly across the bottom of the slow cooker. This gives flavor and helps keep the burgers from sticking directly to the bottom.

Lay the frozen beef patties in a single layer over the onions. If they don’t all fit in one layer, you can slightly overlap them, but avoid stacking them too thick so they cook evenly.
Sprinkle the sliced mushrooms over and around the frozen patties so they tuck into the spaces between the burgers.
Shake the bottle of steak sauce well, then pour the steak sauce slowly and evenly over the frozen beef patties, onions, and mushrooms. Make sure each patty gets a good drizzle so the steakhouse flavor soaks in as they cook.
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