In a large mixing bowl, combine ricotta, mozzarella, Asiago, and Parmesan cheeses. Add the egg and Italian seasoning and mix well with clean hands.
In a medium-sized skillet, heat oil over medium-high heat. While the oil is heating, take tablespoonsfuls of the ricotta mixture and form into a 1 to 2-inch balls. Lightly roll the cheese balls into the Italian bread crumbs and then lightly into the Panko bread crumbs.
Carefully place the cheese balls into the oil in small batches. Do not overcrowd the skillet. Let cook for about 1 to 2 minutes, then carefully flip the cheese balls over with a slotted metal spoon. Once the cheese balls have a golden brown color, remove them using the slotted spoon and place on a paper-towel lined plate to drain excess grease. Serve warm with warm marinara sauce.