In a medium bowl with a lid, add the yogurt, lemon juice, turmeric, garam masala, half of the salt, and half of the pepper. Whisk to combine, then add the chicken and toss to coat. Cover, and refrigerate for 6 hours or overnight.
In a large saucepan, melt the ghee over medium heat. Add the ginger, cumin seeds, onion powder, garlic powder, and chili powder and cook, stirring often, until golden and fragrant, about 3 minutes.
Add the diced tomatoes, Serrano pepper, the remaining salt and pepper and cook until the tomatoes and chiles soften, about 3 minutes. Add the chicken and its marinade and cook for 5 minutes. Stir in 1/4 cup water. Bring the mixture to a boil, then lower the heat to a simmer, and cook, uncovered, stirring occasionally, for 20 minutes.
Stir in the cream and tomato paste, and simmer, stirring occasionally, until the chicken is cooked through and the sauce has thickened up a bit more, about 5 minutes.
Stir in the almonds, garnish with the cilantro leaves, and serve.