Preheat the Oven: Preheat the oven to 400°F so it’s ready when the bread is assembled.
Prep the Veggies: Dice the tomatoes, thinly slice the red onion, and cut the avocado into wedges. Keep them separate so assembly is quick and neat.
Grill the Turkey: Heat a grill pan over medium-high heat. Cook the turkey patties until browned with grill marks and cooked through, about 4 to 6 minutes per side. Let them rest for 2 minutes, then slice into strips.
Grill the Avocado: Place the avocado wedges cut-side down on the hot grill pan. Grill until lightly marked, about 1 to 2 minutes, then remove carefully so they don’t fall apart.
Build the Salad: Add the mixed greens to a large bowl. Add the sliced red onion and diced tomatoes, then top with the grilled avocado wedges.
Finish the Salad: Sprinkle with about 1/2 cup of the crumbled feta and most of the pepitas (save a little for the bread). Add the sliced turkey, drizzle with the lemon vinaigrette, and toss gently until everything is lightly coated.
Assemble the Bread: Place the split loaf cut-side up on a baking sheet. Spread the sun-dried tomato spread evenly over both halves. Top with the remaining feta and the remaining pepitas.
Bake the Bread: Bake at 400°F until warmed through and lightly crisp at the edges, about 8 to 10 minutes. Slice and serve alongside the salad.