Preheat the oven to 350 degrees and prepare a small 1-2 quart baking dish with a coating of cooking spray. Set aside.
In a large skillet, melt butter over medium high heat and cook shrimp and green onion for 2-3 minutes or until pink and cooked through.
Add the garlic and cook for one additional minute.
Turn off the heat and add the cream cheese, mayonnaise and lemon juice to the skillet.
Stir continuously or until fully melted.
Add ¼ cup parmesan cheese, ½ cup mozzarella, sour cream, salt and black pepper to the skillet and stir until the cheese is mostly melted.
Transfer into the prepared baking dish and sprinkle the paprika or Old Bay Seasoning on top.
Top with the remaining parmesan and mozzarella cheese and bake in the preheated oven, uncovered for 30 minutes or until lightly browned and hot and bubbly.
Remove from the oven and serve hot with your favorite crackers, vegetables or bread.
Notes
Make it spicy - Add some hot sauce or red pepper flakes to amp up the heat!