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Prepare the Slow Cooker:
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Place the sliced mushrooms and onions at the bottom of the slow cooker.
Make the Patties:
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In a bowl, combine the ground beef, egg yolk, minced onion, Panko breadcrumbs, milk, minced garlic, salt, and pepper. Mix well.
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Form the mixture into six equal-sized patties.
Brown the Patties:
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Heat a skillet over medium-high heat and sear each patty for about 3 minutes on each side until golden brown.
Layer in Slow Cooker:
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