Combine cream cheese, ranch dressing, and garlic in a small bowl. Whisk with a fork until smooth and evenly combined. Spread on top of pita bread, in pizza sauce fashion (leaving about 1/2 an inch around the edge).
Top with diced chicken, sliced jalapeño, and then top with the cheddar cheese.
Toss the panko bread crumbs with the butter until they are evenly coated. Sprinkle the bread crumb mixture over the cheese.
Bake for 7-10 minutes or until cheese is bubbly and the panko crumbs are a golden brown.