Preheat the oven to 400°F.
In a shallow bowl, combine the almond flour, salt, and pepper.
Whisk the egg white in another bowl.
Dip the chicken breast in the egg white, then coat evenly with the almond flour mixture.
Place the coated chicken on a baking sheet lined with parchment paper.
In a separate bowl, toss the cauliflower with olive oil, mixed herbs, salt, and pepper.
Spread the cauliflower on another baking sheet in a single layer.
Roast both the chicken and cauliflower in the preheated oven. Bake the chicken for about 20-25 minutes (or until the internal temperature reaches 165°F) and roast the cauliflower for 18-20 minutes until tender and slightly browned.
Remove from oven, plate the chicken alongside the roasted cauliflower, and serve immediately.