Jalapeno Cheddar Burgers (Turkey or Beef)

Bahan-bahan (4 porsi)

• 1 ¾ pounds lean ground beef (or ground turkey)
• 2 tablespoons finely minced onion
• salt and black pepper (to taste)
• 4 tablespoons cream cheese
• 2 ounces cheddar cheese (shredded)
• ¼ teaspoon garlic powder
• 1 jalapeño (diced, seeds removed if you prefer less spice)
• 1 tablespoon olive oil
• hamburger buns