Spicy Chicken Naan Wraps

Name: Spicy Chicken Naan Wraps
Ingredients: 1 seedless cucumber, thinly sliced; 2 teaspoons garam masala; Kosher salt and freshly ground pepper; 1/3 cup plain Greek yogurt; 1/2 cup mango chutney; 1 red jalapeno or Fresno chile pepper (1/2 chopped, 1/2 sliced; remove seeds for less heat); 1/2 cup chopped fresh cilantro, plus more for topping; Juice of 1 to 2 limes; 1 1/2 pounds skinless, boneless chicken breasts (about 3 medium); 1 tablespoon extra-virgin olive oil; 4 pieces naan bread; 1/4 small red onion, thinly sliced