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in large bowl, mash bread, milk, garlic powder, salt and pepper into smooth paste
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add beef and lightly knead mixture until well combined
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divide meat into 4 equal portions
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using half of each portion, encase cheese to form mini burger patty
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mold remaining portion around the mini burger, seal edges to form a ball
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flatten ball to form 3/4-inch-thick patty
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cover and refrigerate for at least 10 min
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heat grill – for 10-15 min on high
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turn grill to medium
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grill and cook without pressing on them – 12 to 16 minutes, flip halfway through
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tent with aluminum and let rest for 5 minutes