Heat skillet on medium high and place in sausage. Cook until browned, breaking up sausage into little pieces. Remove when cooked.
In the same pan, add in sliced onion. Cook on medium-low heat until caramelized and golden brown.
Assemble pizza: spread sauce onto pita and place cooked sausage, caramelized onion, and green onion. Top with generous layer of mozzarella cheese and evenly drop dollops of ricotta cheese on top.
Bake in oven for 10-15 minutes or until golden brown. Depending your oven, the underside may become brown first. To brown the top, simply turn on your broiler for about 30 seconds – 1 minute and watch carefully until the top has browned. Otherwise, the pizza will burn.