Preheat oven to 450°.

Heat a large skillet over medium-high heat.

Combine 1/2 teaspoon salt, fennel seeds, 1/4 teaspoon black pepper, garlic powder, and oregano.

Brush chicken with 1 1/2 teaspoons oil; sprinkle spice rub over chicken.

Add 1 1/2 teaspoons oil to pan.

Add chicken; cook 3 minutes or until browned. Turn chicken over; cook 1 minute.

Arrange chicken in an 11 x 7 inch baking dish coated with cooking spray.

Bake at 450° until cooked fully.

Heat remaining olive oil over medium-high heat.

Add bell peppers, shallots, and rosemary; saute 3 minutes.

Stir in broth, scraping pan to loosen browned bits.

Reduce heat; simmer 5 minutes.

Increase heat to medium-high.

Stir in vinegar, 1/4 teaspoon salt, and 1/4 teaspoon pepper; cook 3 minutes, stirring frequently.

Serve bell pepper mixture over chicken.