Butter Naan

Ingredients

3 cups all purpose flour
½ cup unsalted butter, cold
1 cup plain yogurt
3 tablespoons of hot water
1 tablespoon sugar
2 teaspoons active dry yeast (Make sure its freshly bought store yeast and not an opened one)
1 ½ teaspoons salt
1 egg
2 teaspoons chaat masala mixed with 1 tablespoon of vegetable oil