Preheat broiler
Line sheet pan with aluminum foil and spray with non-stick cooking spray. Layer sliced vegetables, and half of the lemon slices. Lightly spritz with olive oil, and a sprinkling of Cajun180 Trinity Seasoning blend.
Lightly rub snapper collars with oil; sprinkle with salt. Layer, skin side down, on top of vegetables, and top with remaining lemon slices.
Broil, rotating pan as needed to ensure even browning, until fish begins to brown, 5-7 minutes.
Flip collars and broil, watching carefully to prevent burning, until skin crisps and caramelizes, about 6 minutes.
Serve snapper collar, skin side up, over roasted vegetables.