Prep the shrimp: Pat shrimp dry with paper towels. Toss with 1 teaspoon Cajun seasoning, 1/4 teaspoon salt, and a drizzle of oil.
Set aside.
Season the veggies: In a bowl, mix bell peppers, onion, and zucchini with 1 tablespoon oil, 1 teaspoon Cajun seasoning, smoked paprika, garlic powder, 1/2 teaspoon salt, and black pepper.
Brown the sausage: Heat a large skillet over medium-high. Add sliced sausage and cook 3–4 minutes, stirring, until edges are browned. Remove to a plate.
Sauté the veggies: In the same skillet, add remaining oil.
Add the seasoned veggies and cook 5–7 minutes, stirring occasionally, until crisp-tender with light char.
Add garlic: Stir in minced garlic during the last minute of cooking so it becomes fragrant without burning.
Cook the shrimp: Push veggies to the sides. Add shrimp to the center in a single layer. Cook 1–2 minutes per side until pink and opaque.
Combine and finish: Return sausage to the skillet.
Squeeze in lemon juice and toss everything to coat. Taste and adjust seasoning, adding more Cajun spice or salt if needed.
Garnish: Remove from heat and sprinkle with chopped parsley. Add lemon wedges on the side if you like extra brightness.
Portion for meal prep: Divide into 4 meal prep containers.
Add optional cauliflower rice or greens to keep it low-carb.