Indian Chicken Tacos

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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