Soak bamboo skewers in water. Thread chicken on skewers, and marinate (in the refrigerator) for an hour or so. Discard marinade. For sauce, melt butter on medium heat. Add garlic & jalapeno; cook 1 minute. Stir in coriander, cumin, paprika, garam masala & salt. Stir in tomato sauce. Simmer 15 minutes. Stir in cream; simmer to thicken- about 5 minutes. Grill or broil chicken, turning occasionally, to cook through- about 8 minutes. Remove chicken from skewers; add to sauce. Simmer 5 minutes. Garnish with cilantro Serve with basmati rice, naan or pita bread. Note: You can make your own garam masala. McCormick also makes garam masala; it's available in super markets.