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Heat a skillet on medium high heat and melt the butter and corn oil.
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Cook the onions for 15 - 20 minutes stirring occasionally.
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Add 1/4 cup of water towards the end of cooking to pick up all the bits from the bottom of the pan.
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Season the beef with the salt, pepper and seasoned salt.
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Form into 8 patties.
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Heat 1 tablespoon grape seed oil on medium heat.
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Place the patties in the pan and cook for 4 minutes per side.
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In the final minute of cooking, add 2 slices of the emmentaler and 1 slice of the gouda to the burgers. Cover with a top and cook for 1 - 2 minutes.
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While the burgers are resting, butter one side of the rye bread.
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Add the rye bread, butter side down, to the skillet and cook for 1 - 2 minutes until browned.
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To serve, place the cheeseburger on the bread. Add as many grilled onions as you can fit.
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Top with the 2nd piece of bread.
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Serve and enjoy!