Chicken Breasts with Glazed Peaches and Fennel and Corn Muffins in Poblano Cups

Name: Chicken Breasts with Glazed Peaches and Fennel and Corn Muffins in Poblano Cups
Ingredients: Cooking spray; 1 box corn muffin mix (recommended: Jiffy); 1/2 cup shredded Mexican cheese blend; 1 (7-ounce) jar chopped pimentos; 2 tablespoons freshly chopped cilantro leaves; 6 poblano peppers, halved lengthwise and seeded; 1 tablespoon olive oil; 1/2 cup sliced red onion; 1 fennel bulb, thinly sliced; 4 roasted chicken breast halves; 1 (14-ounce) can peaches, undrained; 1 tablespoon freshly chopped rosemary leaves