Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Slice the red bell pepper, yellow bell pepper, and red onion into thin, uniform strips.
Spread the vegetables onto the baking sheet, drizzle with olive oil, and sprinkle with the sea salt and black pepper.
Roast the vegetables for 18 to 20 minutes until they are tender and have developed smoky charred edges.
While the vegetables roast, cook the red lentil penne in a pot of boiling water until al dente, then drain and set aside.
Season the chicken breast with a pinch of sea salt and sear in a non-stick skillet over medium-high heat for 6 minutes per side until cooked through.
Remove the chicken from the skillet, let it rest for 3 minutes, then slice it into thin strips.
In the same skillet over low heat, combine the cooked pasta, roasted vegetables, sliced chicken, tomato puree, minced garlic, and dried oregano.
Toss everything together for 2 minutes until the sauce is warmed through and evenly coats the pasta and vegetables.