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Fry the onions: Add butter to a large skillet over medium heat. Add onions, salt, brown sugar, and a pinch of pepper. Cook for 25-30 mins, stirring occasionally, until the onions are deep golden in color.
Meanwhile, make the mustard aioli: To a small bowl, add mayo, mustard, garlic powder, and a pinch of black pepper. Stir well to combine. Allow to chill in the fridge until you’re ready to assemble the sandwich.
Make the sandwich: Top one slice of bread with ¼ cup Dubliner cheese, half the fried onions, and ¼ cup smoked gouda. On another slice of bread, schmear a heaping tablespoon of aioli crust to crust. Close the sandwich aioli side in. Repeat with remaining bread, cheese, onions, and aioli. You will have some aioli leftover.
Heat a large non stick skillet over medium high heat. Spread Irish butter crust to crust over the top side of each sandwich. Place sandwiches butter side down in the skillet, and butter the other side of the sandwiches. Cook for 3-4 mins per side until the bread is golden and crisp. Serve immediately, and enjoy!