Blackberry Chicken Salad

Juice of 1 lime

1 Tbsp. extra-virgin olive oil

1/2 tsp. dried oregano

1/4 tsp. chili powder

Kosher salt

Freshly ground black pepper

2 (6- to 8-oz.) boneless, skinless chicken breasts

1/4 cup extra-virgin olive oil

2 Tbsp. balsamic vinegar

1 Tbsp. blackberry jam

1 tsp. honey

Kosher salt

1 Tbsp. extra-virgin olive oil

5 cups packed baby spinach

1 Persian cucumber, thinly sliced

1/4 red onion, thinly sliced

1 avocado, sliced

6 oz. blackberries

1/4 cup crumbled feta

1/4 cup walnuts, toasted