Pat the chicken, steak, and tilapia dry with paper towels to ensure a crisp sear.
Season all three proteins evenly on both sides with sea salt, black pepper, dried oregano, and smoked paprika.
Heat the olive oil in a large cast-iron skillet over medium-high heat until it begins to shimmer.
Place the chicken breast and sirloin steak in the skillet, searing for 3 to 4 minutes per side until they reach your desired doneness.
Add the tilapia fillet to the skillet during the final 3 minutes of cooking, searing until it is opaque and flakes easily with a fork.
Remove the proteins from the pan and set them aside to rest while you prepare the vegetables.
Add the sliced zucchini and red bell peppers to the same skillet, sautéing with the minced garlic for 4 minutes until tender-crisp.
Deglaze the pan by stirring in the lemon juice, scraping up any flavorful browned bits from the bottom.
Serve the protein trio immediately alongside the sautéed vegetables for a clean and hearty meal.