Mix together the crab meat, mayonnaise, mustard, paprika, chili flakes, a bit of pepper, salt and the green onions. Mix it well, then taste, and adjust as you see fit.
Mix the grated cheeses into the crab mixture until well combined.
Cut 4 slices of bread of +/- 1,5 cm thick.
Sprinkle two slices with a little grated cheese and top with half of the crab mixture. Sprinkle a little extra cheese and place the second slice of bread on top. Press gently to make it stick a bit.
Melt 1,5 tbs of butter in a large skillet on medium heat. Add the sandwiches once melted and nice and hot. Cook one side until it is nice and crispy and golden.
Take the sandwiches shortly out of the skillet and melt the rest of the butter. Now return the sandwiches to the pan with the already cooked side on top. Cook until the cheese is melted and the second side is golden brown. Make sure to keep the heat low so the bread doesn’t burn and you have enough time to melt the cheese.
Remove the sandwiches from the pan, cut in half and serve with the coleslaw or a simple green salad.