Heat 2 tablespoons olive oil in a large pot over medium-high heat until it shimmers.
Add the finely chopped carrots, green and red bell peppers, and diced onion; cook 3–4 minutes until they begin to soften.
Add 1 pound ground turkey to the pot and cook, breaking it up, until browned and cooked through.
Stir in crushed tomatoes (28 oz), tomato sauce (15 oz), and tomato paste (6 oz) until combined.
Add the minced garlic, 1/2 tablespoon dried oregano, 1/2 tablespoon dried basil (or Italian seasoning), 1/2 teaspoon sea salt, 1/2 teaspoon cracked black pepper, and 1/4–1/2 teaspoon red pepper flakes if using; stir to combine.
Reduce heat to medium-low and simmer, uncovered or partially covered, for about 30 minutes until the vegetables are tender and the sauce has thickened, stirring occasionally.
Taste and adjust seasoning as needed, then serve over pasta.