Preheat the oven to 425ºF (220ºC).
Combine Italian seasoning, onion powder, salt, pepper, and smoked paprika in a small bowl.
Coat shrimp with the spice mix.
Divide shrimp onto aluminum foil, place broccoli florets alongside.
Add garlic, lemon juice, red chili pepper flakes, salt, and pepper over the shrimp and broccoli.
Add butter pieces on top, pour vegetable stock into each foil packet, then seal and crimp edges.
Bake in the oven for about 15 minutes or until shrimp is cooked through.
Unwrap the foil packets, garnish with fresh parsley and lemon slices before serving.
