Preheat your oven to 425°F. Line a baking sheet with parchment paper for easier cleanup.
Cut the red and green bell peppers into thin strips. Toss them lightly with a pinch of salt and a drizzle of olive oil if desired, then spread on half of the baking sheet.
In a small bowl, prepare the sweet and sour sauce by mixing the pineapple juice, honey, rice vinegar, minced garlic, and grated ginger.
Place the chicken breast on a clean cutting board and pat dry. Lightly pound to even thickness if needed.
In a shallow dish, combine the almond flour. In another bowl, lightly whisk the egg white.
Dip the chicken breast first into the egg white, then dredge in the almond flour ensuring an even, light coating.
Place the coated chicken breast on the other half of the baking sheet. Drizzle a portion of the sweet and sour sauce over the chicken.
Roast in the oven for about 20-25 minutes, turning once halfway through. The chicken should be golden and reach an internal temperature of 165°F, while the bell peppers become tender and slightly charred.
Once cooked, drizzle the remaining sauce over both the chicken and roasted peppers. Serve warm and enjoy your balanced, crispy baked sweet and sour chicken with roasted bell peppers.