Add all the ingredients for the marinade to the bowl of a food processor. Pulse until smooth. Set aside.
1/2 cup plain Greek yogurt, 1/4 cup olive oil, 2 Tablespoons lemon juice, 1 1/2 Tablespoons garam masala, 2 teaspoons ground cumin, 2 teaspoons ground chili powder, 2 teaspoons smoked paprika, 1 teaspoon ground coriander, 1 inch ginger root, 4 cloves garlic, 1 1/2 teaspoon salt, 1/2 teaspoon ground turmeric, 1/2 teaspoon onion powder, 2 Tablespoons tomato paste
Using a sharp knife, cut deep slits into the chicken, being careful not to slice all the way through.
2 ½ pounds chicken leg quarters
Place the chicken in a 13x9 baking dish, and pour the prepared marinade on top, coating it evenly.
Cover, and marinate in the fridge for at least 2 hours or up to overnight.
Preheat the oven to 425 degrees Fahrenheit.
Cover the baking dish tightly with parchment paper followed by foil. Bake 45 minutes. Remove the covers, and continue to bake for 15 minutes or until the top of the chicken is golden and crispy and it has reached an internal temperature of 165 degree Fahrenheit
Store in an airtight container in the fridge for up to 4 days.