Indian Chicken Saag Curry

Ingredients

• 1 pound chicken thighs chopped, or use chicken breast
• 1 tablespoon olive oil
• 1 medium onion chopped
• 1 jalapeno pepper chopped
• 1 serrano pepper chopped (optional, for more heat)
• 4 cloves garlic chopped
• 1 teaspoon fresh ginger chopped
• 1 pound spinach chopped
• 1 tablespoon garam masala
• 1 teaspoon cayenne pepper
• 1 teaspoon turmeric
• 1/2 teaspoon cumin
• 1/2 teaspoon cardamom
• 1/2 teaspoon coriander
• Salt and pepper to taste
• 1/2 cup milk or use heavy cream
• 1/2 cup plain yogurt
• 1 tablespoon butter