In large bowl gently combine shredded cheeses.
Lay out sourdough breads slices, brush both sides with oil.
Place 12 bread slices "bottoms" on sheet pan, oiled side down.
Place 2 slices of Pepper Jack cheese on each side of bottom bread.
Place 4 slices of jalapeño on top of each cheese portion.
Using #20 scoop, carefully place shredded cheese mixture on top of jalapeños. Divide any remaining cheese among the portions.
Place top bread layer on sandwich, oiled side up.
Set Combi oven to 375F and 100% steam. Bake sandwiches uncovered for approx. 10 minutes, or until bread is toasted and cheese is melted.
Hold warm until service.
CCP: Maintain hot food at 135°F or above