Wearing gloves, slice the jalapeños in half lengthwise, remove seeds, and finely dice.

In a bowl, combine cream cheese, half of the diced jalapeños, garlic powder, and onion powder; mix until smooth.

In a large bowl, combine ground beef, remaining jalapeños, salt, garlic powder, onion powder, and black pepper; mix gently.

Divide mixture into six and form patties; place cream cheese filling in the center of three patties and seal with another patty.

Preheat skillet, add olive oil, cook patties for 3-4 minutes per side until golden-brown.

Add cheese if desired and cover for melting at the end.

Assemble burgers on buns with fresh tomatoes and lettuce; serve immediately.