Preheat the oven to 450. Cook the sausage and onion over medium heat until no longer pink. Drain excess fat. Add the rotel and cook another two minutes. Allow the meat the mixture to cool, and then add the ricotta and salt and pepper into the meat mixture and mix well.
Spread olive oil over the top of both pizza crusts. Sprinkle 1 cup of mozzarella each over top the pizza crusts. Sprinkle 1/2 cup of monterey jack each over the mozzarella on each pizza crust. Sprinkle half the amount of meat mixture over top the cheeses on each pizza crust. Cook in the oven for 10-15 minutes or until cheese is melted and bubbly.