Arrange the red potatoes, onion, and red pepper in the bottom of the slow cooker. Add the garlic and arrange the chicken thighs on top.
In a medium-size bowl whisk together the zesty Italian dressing, lemon juice, and flour; pour the mixture over the chicken.
Cook on low for 6 -7 hours, or until chicken is done, and vegetables are tender. Add the frozen peas and continue cooking until peas are heated through.