These green beans simmered in a fragrant mixture of tomatoes, onions, and garlic are delicious as a side dish or as a topping for pasta, rice, or baked potatoes.
For the best flavor, heat the oil in a small skillet over medium heat. Add the garlic and cook until fragrant, about 1 minute. Alternatively, omit the oil and sauté the garlic in a few tablespoons of water or place the garlic in a microwave-safe bowl with a little water, cover, and microwave for 1 minute.
Lightly oil the insert of the slow cooker or spray it wi