Tasty prime rib Philly stuffed mushrooms are a match made in heaven combining your amazing prime rib leftovers and portobello mushrooms! Saute some onions and heat the bite-size pieces of leftover prime rib, roast beef, or steak, then bake to perfection!
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Instructions
Preheat your oven to 400°F (205°C), line a baking sheet with parchment paper, and lightly coat the parchment paper with nonstick cooking spray or oil.
Place your cleaned portobello mushrooms onto the prepared baking sheet then coat the inside with the first ½ tablespoon of olive oil and season with salt and pepper.
In a large skillet or frying pan heat the second ½ tablespoon portion of olive oil to medium-high heat until just beginning to smoke. Add the onions and saute until starting to get tender, about 2 minutes. Add the sliced prime rib leftovers and toss with onions. Continue to saute until warmed and softened, about 2 additional minutes.
Portion the prime rib and onions into each prepared mushroom then top with shredded mozzarella (or provolone cheese). Bake at 400°F (205°C) for 20-25 minutes or until the mushrooms are softened and the cheese is fully melted.
Once done, sprinkle with chopped parsley and serve immediately.