Chicken Pumpkin Stew

11/2 lb skinless, boneless chicken thighs, visible fat trimmed, cut in 1-in. pieces

1 medium onion, chopped

1 red pepper, cut in 1-in. pieces

1 tsp minced garlic

1 can each (141/2 oz each) chicken broth and diced tomatoes

1 Tbsp smoked paprika

1/2 tsp salt

3 cups 1-in. cubes peeled sugar pumpkin or butternut squash (1 lb)

8 oz fresh green beans, cut in half

1 Tbsp cornstarch

1/4 cup reduced-fat creamy peanut butter