Slow Cooker Sausage and Peppers

Bahan-bahan (6 porsi)

• 1 ½ tablespoons extra-virgin olive oil (divided)
• 2 ½ pounds Italian turkey sausage links
• 1 large yellow onion (halved and cut into ¼-inch-wide strips)
• ½ teaspoon kosher salt
• ¼ teaspoon ground black pepper
• 4 cloves garlic (chopped)
• ¼ teaspoon red pepper flakes (plus additional to taste)
• ¼ cup dry red or white wine (or swap additional low-sodium chicken broth)
• 1 large red, yellow, or orange bell pepper (cored and cut into ¼-inch strips)
• 1 large green bell pepper (cored and cut into ¼-inch strips)
• 1 (28-ounce) can crushed tomatoes
• Cooked whole wheat pasta
• Zucchini noodles
• Split and toasted hoagie buns ((with provolone cheese for a true Italian spin))