Preheat oven to 375º.
Arrange the potatoes in a single layer in a roasting pan coated with cooking spray. Drizzle with 1 teaspoon oil, and sprinkle with 1/2 teaspoon salt and black pepper. Toss to coat. Bake at 375º for 40 minutes or until tender, turning occasionally.
While potatoes cook, heat 1 teaspoon oil in a large nonstick skillet over medium-high heat. Pierce the sausage casings several times with a fork. Add sausages to pan; cook 5 minutes or until lightly brown. Remove sausages from pan.
Heat 2 teaspoons oil in pan. Add bell peppers; sauté 5 minutes or until tender. Add garlic; sauté 1 minute. Stir in 1/4 teaspoon of salt, vinegar, rosemary, and crushed red pepper. Return sausages to pan; cover and cook over medium-low heat 15 minutes or until the sausages are done.