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In a large skillet on medium high heat add the olive oil and stir until pan is coated.
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Add in the diced onion and green bell pepper and cook until the onion is translucent.
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Add in the ground beef and cook until all the ground beef is broken up and browned.
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Drain off any excess grease.
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Stir in the Worcestershire sauce, ketchup, taco seasoning, salt and pepper.
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Add in the beef base, water and cornstarch and stir until well combined.
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Cook for a few minutes until the mixture thickens a bit.
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Carefully slice the slider buns in half. Place the bottom half of the buns into a 9x13 glass dish.
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Sprinkle the ground beef mixture over the top of the buns.
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Top mixture with grated cheese.
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Broil in the oven until the cheese is melted and bubbly…be careful not to let it burn. Quickly remove from oven.
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Place the top half of the buns on top of the melted cheese.
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Gently cut the sliders apart and serve warm.