Easy Chicken Curry

2 onions , big chopped 4 tomatoes , chopped 1 1/2 teaspoons chili powder (Curry, change depending on ur taste) 1/4 teaspoon turmeric powder 1 inch cubic piece[...]

4 large skinless chicken breasts , cut into chunks 3 tablespoons vegetable oil 1 teaspoon mustard seeds , brown 1 large onion , sliced 3 garlic cloves ,[...]