INGREDIENTS
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2 tablespoons olive oil, divided
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2 medium yellow onions, halved and slicedthin
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2 teaspoons kosher salt, divided
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1 pound cremini mushrooms, sliced
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2 poblano peppers,sliced thin
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2 cubanelle peppers, sliced thin
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1/2 teaspoon freshly ground black pepper
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12 wavy lasagna noodles
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2 pounds cooked roast beef, sliced thin
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12 slices sharp provolone
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1 (15-ounce) jar Cheez Whiz
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1 cup freshly grated aged provolone