Place ricotta in a bowl and fluff with a fork until it is light and airy.
Spread a thin layer of sauce in the bottom of a 9”x13” baking dish. Place a layer of pasta sheets on the sauce and then spread on a thin layer of ricotta cheese.
Next sprinkle some shredded mozzarella and half of the sausage. Then layer 1/3 of the pepperoni and 1/3 of the chopped oregano.
Repeat next layer the same. Then cover with rest of sauce, mozzarella, pepperoni and oregano.
Place uncovered dish on a larger baking sheet in the middle rack of your oven and bake at 375 degrees F for 30-40 minutes.