Preheat the oven to 350°F. Heat the olive oil in a skillet over MED-HIGH heat. Add the onions, garlic, mushrooms, and sausage meat. Break up the meat with a spoon and cook it until it has turned brown.
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Add the Italian herbs and the red pepper flakes. Stir.
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Whisk the ricotta, egg, half the Parmesan, and a pinch of salt until smooth.
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In a 9″ x 9″ casserole dish layer in half the marinara sauce, then a single layer of lasagna sheets, then half the ricotta mix, pepperoni slices, and olives. Repeat the layers, from the sauce to the olives.
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