Preheat the oven to 400F. Spray 2 large nonstick baking trays with cooking spray.
Combine the shrimp, garlic, oil and crushed red pepper together in a bowl and stir to combine.
Arrange the shrimp on a baking sheet in a single layer. Roast 6 to 8 minutes or until the shrimp turns opaque. Squeeze lemon over the shrimp and garnish with parsley.