Spicy chicken curry

2 tablespoons vegetable oil
1/2-1 lbs meat, cut into bite-sized pieces (can use beef, pork, chicken, lamb or goat)
1 yellow onion, diced
3 cloves garlic, minced
2 teaspoons grated ginger root
1/2 to 2 tablespoons of garam masala, curry powder or a combo of both
2 cups broth (can use vegetable or chicken)
2 medium tomatoes, chopped, or 1 (15.5 ounces) can of diced tomatoes
1/2 cup heavy whipping cream, coconut milk or full-fat Greek yogurt