Brush the bottom interior of the slow cooker with some olive oil, or spray with non stick cooking spray.
2 tablespoon olive oil
Cut the tops off each bell pepper, and remove the attached seed core membrane and seeds.
6 large bell peppers
In a large skillet over medium-high heat, add the olive oil, onions, celery, and garlic. Cook, stirring often, until onions and celery are tender.
1 onion, 2 stalks celery, 4 cloves garlic
Add the cut sausage and pre-cooked rice to the skillet, cooking until heated through.
14 oz Andouille sausage, 1½ cup cooked rice
Add the tomato sauce, Cajun seasoning, and Oregano stirring until blended.
8 oz tomato sauce, 1 tablespoon Cajun seasoning, ¼ teaspoon oregano
Taste the sausage and rice filling, then season with salt and pepper to taste. Stuff the bell peppers with the sausage and rice mixture.
salt, pepper
Cover the slow cooker and cook on Low for 4 to 5 hours or on High for 2 to 3 hours.
Uncover, let sit for 15 minutes, then transfer stuffed bell peppers to a serving platter and enjoy!