Heat oven to 425°F. Spray 13x9-inch pan with cooking spray. Press pizza dough in bottom and slightly up sides of pan to form crust. Bake about 7 minutes or until crust just begins to turn brown on edges.
Meanwhile, in 6-inch skillet, cook turkey and garlic over medium-high heat 5 to 7 minutes, stirring occasionally, until turkey is no longer pink. Stir in oregano and salt.
Spread sour cream over warm crust. Sprinkle with 1 cup of the mozzarella cheese. Evenly top cheese with cooked turkey. Sprinkle with cucumber and tomato. Separate red onion into rings; arrange over tomato. Sprinkle with remaining 1/2 cup mozzarella cheese and the feta cheese.
Bake 13 to 14 minutes or until edges of crust are golden brown and cheese is melted.