Preheat oven to 400 degrees F (200 degrees C). Grease a sheet pan with 2 tablespoons olive oil.
Place salmon fillets, red and yellow bell peppers, and onion on the prepared sheet pan.
Combine lemon juice, 3 tablespoons olive oil, water, maple syrup, garlic, salt, red pepper flakes, cumin, and parsley in a small bowl. Drizzle 2/3 of the sauce over the ingredients on the sheet pan.
Bake in the preheated oven until salmon is cooked through and flakes easily with a fork, 10 to 15 minutes.
Serve with lemon slices and remaining sauce.
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