Combine Ground Beef, onion, jalapeño, cilantro and 1/4 cup cheese in medium bowl, mixing lightly but thoroughly. Lightly shape into four 1/2-inch thick patties.
Heat large nonstick skillet over medium heat until hot. Place patties in skillet; cook 10 to 12 minutes turning occasionally, until instant-read thermometer inserted horizontally into center registers 160°F, turning occasionally. About 3 minutes before burgers are done, top evenly with remaining 1/4 cup cheese.
Place burgers in tortillas or buns; season with salt and black pepper, as desired. Top with desired toppings.
Nutrition information per serving: 324 Calories; 162 kcal Calories from fat; 18 g Total Fat; 8 g Saturated Fat; 7 g Monounsaturated Fat; 88 mg Cholesterol; 17 mg Sodium; 14 g Total Carbohydrate; 1.9 g Dietary Fiber; 25 g Protein; 2.6 mg Iron; 5.2 mg NE Niacin; 0.4 mg Vitamin B6; 2.4 mcg Vitamin B12; 6 mg Zinc; 20.6 mcg Selenium;