Cook pasta according to package directions, omitting salt and fat. Drain, reserving 2 tablespoons cooking liquid.
Combine broth, peanut butter, 1 1/2 tablespoons sesame seeds, and next 5 ingredients (through hot pepper sauce).
Heat the oil in a large skillet over medium-high heat. Sprinkle the chicken with salt. Add chicken to pan; sauté 3 minutes. Add carrots and onions; sauté 2 minutes or until chicken is done. Stir in broth mixture.
Add reserved cooking liquid and pasta to pan, tossing to coat. Top with remaining 1 1/2 teaspoons sesame seeds; serve immediately.