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Combine chorizo, ground meat, garlic, salt, and pepper in a bowl. Mix gently using your hands until combined.
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Divide the beef mixture into 12 equal portions and with hands shape into small burger patties. If making in advance, cover, and place into the refrigerator until ready to cook.
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Fry bacon and slice onions.
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Bake rolls according to package directions.
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Heat a large non-stick skillet over medium-high heat. Cook patties in batches for 3-5 minutes per side, then top with cheese. Place on a baking sheet in a warm oven.
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Slice rolls, spread mayo, place patty on bottom bun, top with bacon, onions, and pickles.
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Serve warm.