Preheat your oven to 375°F. Place the halved jalapenos, cut side up, on a lined baking sheet. Roast them for 10-12 minutes, or until they soften slightly. This will mellow their spice and bring out a deeper, roasted flavor.
While the jalapenos roast, combine the cream cheese, cheddar, and Monterey Jack in a mixing bowl. Mix well until creamy and uniform. If you love bold flavors, consider adding a hint of cumin or garlic powder.
Take the roasted jalapenos and rough chop them into smaller pieces. Lay out two slices of sourdough bread and slather each with half the cheese mixture. Top with chopped jalapenos, crispy bacon, and, if you like, some crushed tortilla chips for texture.
Spread softened butter generously on the outside of each slice of bread. This will ensure a perfectly crisp and golden crust.
Heat a non-stick skillet over medium-low heat. Place the assembled sandwiches onto the skillet, butter side down. Grill until the bread is golden and the cheese is melted, approximately 3-5 minutes per side. Keep an eye on it to avoid burning.
Once perfectly grilled, slice the sandwiches in half and serve immediately. The cheese should be gooey and irresistible!