Place polenta slices on cookie sheet and brush slices with 1 teaspoon oil on both sides; sprinkle with 1/4 teaspoon salt and 1/2 teaspoon freshly ground black pepper to season both sides.
Place cookie sheet in broiler 6 inches from source of heat and broil polenta 18 to 20 minutes or until golden.
Set polenta slices aside.
Meanwhile, in 12-inch skillet, heat 2 teaspoons oil on medium until hot.
Sprinkle chicken with 1/4 teaspoon salt and 1/4 teaspoon freshly ground black pepper.
Add chicken to skillet and cook 5 to 6 minutes or until chicken is golden and no longer pink throughout, stirring occasionally.
Transfer chicken to bowl.
To same skillet, add remaining 1 tablespoon oil; reduce heat to medium.
Add peppers and onion; cook 8 minutes or until vegetables are tender, stirring occasionally.
Stir in vermouth and capers; increase heat to medium-high and cook 2 minutes.
Return chicken to skillet; cook 1 minute or until heated through, stirring.
Serve chicken and vegetables over broiled polenta slices.