Shortcut Chicken Tandoori Pizzas

Name: Shortcut Chicken Tandoori Pizzas
Ingredients: 1 cup plain whole-milk yogurt; 3 tablespoons jarred tandoori paste or marinade; 1 pound thin skinless, boneless chicken breasts; Kosher salt and freshly ground pepper; 1/2 English cucumber, grated on the large holes of a box grater; 1 tablespoon unsalted butter, at room temperature; 4 pieces naan bread; 1/4 teaspoon garam masala; 1/2 cup packed fresh cilantro and/or mint, roughly chopped, plus more for topping; Juice of 1/4 lemon; 4 ounces paneer, halloumi or feta cheese, cut into small pieces; 1/4 red onion, thinly sliced