Toss cubed bread with olive oil, granulated garlic, and Italian seasoning. Spread bread in an even layer on a baking sheet and bake for 15-20 minutes or until croutons are golden brown and toasted. Toss croutons halfway through baking.
Meanwhile, make salad dressing. Combine yogurt, feta, buttermilk, lemon juice, olive oil, dill, and garlic in a blender. Puree until smooth. Season with salt and pepper and set aside.
Toss shrimp with 1 tablespoon olive oil, zest of 1 lemon, granulated garlic, salt, and pepper. Heat 1 tablespoon oil a large saute pan over high heat and add shrimp, making sure not to overcrowd the pan. Cook shrimp until pink and firm, about 4-5 minutes. Remove from heat.
Assemble salads. Portion little gem lettuce and frisse into bowls and top with chopped cucumbers and chopped red onion. Lay shrimp on top and top with chopped parsley, crumbled feta, and croutons. Sprinkle freshly cracked black pepper on top and serve with creamy feta yogurt dressing.
Notes
The croutons and creamy feta yogurt dressing can be prepared up to 3 days in advance. Store croutons in an airtight container at room temperature.