Preheat your oven to 425°F and line a baking sheet with parchment paper.
Slice the bell pepper into strips, toss lightly with salt, pepper, and a drizzle of olive oil if desired, then spread on one half of the baking sheet.
In a small bowl, whisk the egg white with garlic powder, a pinch of salt, and pepper. In another shallow dish, place the almond flour.
Dip the chicken breast in the egg white mixture, then dredge evenly in almond flour. This will create your crispy coating.
Place the coated chicken on the other half of the baking sheet.
Bake for 20-25 minutes until the chicken is cooked through and the coating is golden brown. At the same time, roast the bell peppers until tender.
While baking, prepare the sweet and sour sauce by combining pineapple chunks, soy sauce, and honey in a small saucepan. Warm over low heat for 3-4 minutes until slightly reduced, stirring occasionally.
Once the chicken and peppers are done, drizzle the warm sweet and sour sauce over the chicken, and serve alongside the roasted bell peppers.