Heat a large nonstick skillet over med-high. Add ground turkey; cook 3 minutes, stirring to crumble. Add onion and next 5 ingredients to pan; cook 4f minutes or til veggies are crisp-tender. Remove from heat and stir in salsa.
Unroll dough; divide into 4 equal portions. Roll each portion into a 6x4 inch rectangle. Working with one rectangle at a time, spoon about 1/2 c turkey mixture on one side of the dough. Top with 3 T cheese. Fold dough over turkey, and press edges together with a fork to seal.
Place on a baking sheet coated with cooking spray. Repeat with remaining ingredients. Bake at 425 for 12 min or til browned. Serve with salsa and sour cream if desired.