In a medium bowl, stir together ricotta cheese, garlic powder, 1/2 tsp oregano, Parmesan cheese and black pepper. Set aside.
In a skillet over medium heat, brown sausage, breaking it into small pieces as it cooks (about 4-5 minutes or until cooked through). Drain off excess grease, if necessary.
To the sausage, add marinara sauce and 1 tsp. oregano. Stir to combine, bring to a simmer and cook 4-5 minutes to bring the flavors together.
While the sauce is cooking, in a 2 or 2.5 quart baking dish, spread the ricotta cheese mixture all over the bottom of the dish.
Top the ricotta layer with half the sausage/sauce mixture.
Sprinkle half the mozzarella over the sauce.
Then layer on the remainder of the sauce, followed by the rest of the cheese.
Bake at 425°F for 15 minutes or until slightly browned and bubbly.
Serve hot with lots of crusty bread for dipping!!