Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a shallow dish, pour the buttermilk and season it with salt, pepper, and a pinch of garlic powder.
Add the chicken breast to the buttermilk, ensuring it’s well-coated. Let it marinate for at least 30 minutes in the refrigerator.
Place the almond flour in a separate shallow dish. After marinating, dredge the chicken breast in the almond flour, ensuring a light and even coating on all sides.
Arrange the coated chicken on the prepared baking sheet.
In a bowl, toss the broccoli and red bell pepper with 1/2 tablespoon of olive oil, salt, and pepper.
Spread the vegetables around the chicken on the baking sheet.
Bake in the preheated oven for 20-25 minutes or until the chicken is fully cooked and the coating is golden and crispy, while the vegetables are tender and slightly charred at the edges.
Remove from the oven, let the chicken rest for a few minutes, and serve warm.