Masala Fried Chicken

Name: Masala Fried Chicken
Ingredients: 1 3 piece ginger, peeled, coarsely chopped; 4 garlic cloves; ¼ cup distilled white vinegar; ¾ cup whole-milk Greek yogurt; ¼ cup Kashmiri red chili powder; 1 Tbsp. garam masala; 2½ tsp. kosher salt; 1 tsp. ground turmeric; 2 lb. skinless, boneless chicken thighs (about 10), cut into 1 strips; 3 Tbsp. Kashmiri red chili powder; 1 Tbsp. chaat masala; 2½ tsp. amchur powder; 1½ tsp. freshly ground black pepper; Canola oil (for frying; about 8 cups); 2¼ cups potato starch; 1¼ cup all-purpose flour; A deep-fry thermometer