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Put a tortilla on a plate, covered with a damp paper towel. Alternate tortillas with paper towels. Microwave for 30 seconds to one minute, depending on how many tortillas. Preheat the oven to 250 degrees. Wrap a stack of tortillas in a damp dish towel and place in a casserole dish of similar size. Cover with a lid or a piece of aluminum foil tightly on the dish. Place in oven for 20 minutes. Once the tortillas are heated, transfer them to a tortilla warmer to keep them nice and hot.
Heat a toaster oven to 400 degrees. Spray a pizza pan small enough to fit in toaster oven with cooking spray. Heat a large skillet over high heat and place tortilla into the hot skillet. Cook tortilla until heated through, about 5 minutes; spread with pizza sauce and scatter tomato and pineapple pieces over sauce. Sprinkle pizza with basil, oregano, and garlic powder. Arrange ham pieces onto pizza and top with mozzarella cheese. Continue to heat pizza until tortilla is browned and crisp, 3 to 5 more minutes. Transfer pizza to the prepared pizza pan. Cook in the preheated toaster oven until cheese begins to brown, about 10 minutes.