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1.
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Into a medium skillet, add butter and melt on medium-high.
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Once melted, add onions.
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Toss to coat in the melted butter.
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Reduce heat to medium/medium-low.
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Cook for 10 minutes, stirring occasionally.
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Add a pinch of salt and pepper and small pinch of sugar.
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Cook and stir until brown and translucent (this took 10-15 minutes for me).
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2.
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While onion is cooking, form the hamburger into small patties the size of the slider buns.
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Sprinkle each side with salt and pepper.
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Cook in a large skillet on medium/medium-high heat until meat is done/cooked through.
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3.
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Tear the American cheese into slices the size of the hamburger.
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Place on top of the hamburger that is still in the skillet.
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Using tongs or a fork, place your cooked onions on top of the cheese.
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Allow cheese to melt.
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4.
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Toast your slider buns (sliced in the middle of course) in another skillet, a toaster oven, or for added flavor this is what I did: I scooted the cooked onions over in the medium skillet over to the side.
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While on low/medium, I toasted the buns in the leftover onion juices in the skillet.
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It doesnt dirty up another dish and it tastes great!
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Toast the flat side of each bun approximately 2 minutes.
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5.
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Take your hamburger topped with cheese and onions and place in the toasted bun.
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Some restaurants also put a dill pickle on top, but I thought the strong flavor of our Claussen Dill pickles would overpower the onion/cheese and hamburger goodness.
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Im glad I didnt add a pickle but you can add one if you want!