Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Slice the carrot into thin rounds and chop the bell pepper into bite-sized pieces.
Place the broccoli, carrots, and bell peppers on the baking sheet, tossing them with 0.5 tbsp of olive oil, half the salt, and half the pepper.
Roast the vegetables for 18-20 minutes until they are tender and show slight golden-brown edges.
While the vegetables roast, season both sides of the chicken breast with the dried oregano, garlic powder, and the remaining salt and pepper.
Heat the remaining 0.5 tbsp of olive oil in a medium skillet over medium-high heat.
Place the chicken in the skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden.
Remove the chicken from the heat and let it rest for 3 minutes before slicing.
Plate the roasted vegetables alongside the chicken and drizzle everything with the fresh lemon juice for a bright finish.