Slow Cooker Italian Chicken and Marinara

INGREDIENTS

2 tbsp

olive oil

1/2 cup

finely chopped onion

garlic cloves, minced

1 28 ounce can

crushed or ground, peeled tomatoes

1 6 ounce can

tomato paste

1 tbsp

dried oregano

3 tbsp

sugar

1 tsp

salt

1 tsp

freshly ground black pepper

(5- to 6-ounce) chicken breasts (2 pounds total)

1/2 cup

packed fresh basil, finely chopped

3/4 cup

freshly grated Parmesan cheese