Heat oven to 190ÂșC Place tortillas on cookie sheet. Bake 5 minutes or until lightly toasted. In small bowl, mix tomatillos, tomatoes, jalapenos, cilantro, juice, garlic, pepper sauce, cumin and salt. Stir in 1 cup cheese. Mix chicken with chili powder, tossing to coat. Spray skillet with Pam. Cook chicken until tender. For each pizza, spreac half cup tomato mixture on 1 tortilla. Top with chicken, onion wedges and quarter cup remaining cheese. Bake 10 to dozen minutes or until cheese is melted.