Preheat oven to 425°F. Heat oil in lg skillet over med-high heat. Add garlic and ground turkey, saute until turkey is slightly brown. Add onions, mushrooms and bell pepper, saute 2 min. Remove from heat, sprinkle with salt.
Lightly coat pizza crust with cooking spray; Place on an ungreased baking sheet. Spoon marinara sauce onto crust, spread over crust, leaving a 1-inch border around edge. Top with turkey mixture, sprinkle with cheese.
Bake for 12 min or until crust is golden and cheese is melted.