In a small bowl combine, cream cheese, grated cheddar cheese, diced jalapeño and garlic powder.
Use your hands to roll filling into a ball and flatten into 3 equal sized patties.
In a mixing bowl, use your hands to combine ground beef, minced onion, salt and pepper.
Separate meat into 6 equal sized portions.
Flatten out each piece of beef into thin patties slightly larger in diameter than the cheese filling patties.
Place a cheese filling patty in the center of a beef patty, and top with another beef patty.
Use your fingers to pinch together the edges to enclose cheese filling and form evenly shaped burger patties.
Baste patties with olive oil.
Preheat barbecue grill.
Grill patties for 6-7 minutes on each side over medium high heat until cooked through.
Top patties with your favorite burger toppings to serve.