Slice peppers in half lengthwise, remove ribs and seeds and set aside.
In a large skillet, sauté the onions and garlic in broth over medium-high heat for about 5 minutes, or until onions are translucent. Add the mushrooms, and continue to cook until mushrooms are tender.
Mix in the roast beef and heat through, about 3 to 5 minutes. Remove skillet from heat, and stir in cream cheese.
Line the inside of each bell pepper with a quarter slice of cheese. Next, fill each pepper with an eighth of the roast beef mixture, then top with the another quarter slice of cheese. Repeat for remaining bell pepper halves. Bake for 15 to 20 minutes until peppers are tender and cheese on top is melted and bubbly.
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