Place beans, lemon juice, Tahini, cumin seed, garlic powder and oregano in a food processor; process until smooth.
Heat oil in skillet over medium-high heat. Add onion and cook 5 to 7 minutes or until golden brown. Spread 1/2 cup hummus onto pizza crust. Top with onion and spinach; sprinkle evenly with Asiago, feta and mozzarella cheeses. Bake 12 to 14 minutes or until cheese is lightly browned.
Serve remaining hummus with pita chips. Or use as a sandwich spread.