Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
In a shallow bowl, whisk together the almond flour, dried oregano, garlic powder, sea salt, and black pepper until well combined.
Pat the chicken breast completely dry with a paper towel, then brush it with 0.5 tablespoon of the olive oil.
Press the top of the chicken breast firmly into the almond flour mixture to create an even, golden crust.
Place the sliced red bell peppers and broccoli florets on the baking sheet, toss with the remaining 0.5 tablespoon of olive oil, and spread them into a single layer.
Nestle the herb-crusted chicken onto the baking sheet next to the vegetables.
Roast for 18 to 22 minutes, or until the chicken is cooked through to an internal temperature of 165°F and the vegetables are tender and slightly charred.
Remove from the oven and finish with a bright squeeze of fresh lemon juice over the entire plate before serving.