Pesto Infused White Bean and Sun-Dried Tomato Stew (Crockpot)

1 large vidalia onions or 1 large sweet onion , chopped

1 red bell pepper , seeded and diced

3 large tomatoes , ripe, peeled, seeded, and chopped or 1 (14 1/2 ounce) can diced tomatoes

1/4 cup sun-dried tomato

3 cups cannellini beans or 3 cups white kidney beans , drained and rinsed, if canned

1 1/2 cups vegetable broth

salt

fresh ground pepper

1/4 cup pesto sauce , basil