Preheat broiler, and line a large baking sheet with aluminum
foil.
In a large skillet set over medium-high heat, melt the butter
until foamy. Add garlic and cook until fragrant, about 30
seconds. Remove from heat, and stir in artichoke hearts,
mozzarella, cheddar, Parmesan, sour cream and shallot until
combined.
Slice the bread lengthwise. Place the bread halves on the
prepared baking sheet, cut side up, and spoon the cooled cheese
and artichoke mixture overtop. Broil until cheese is melted and
bread is hot. Cut each half into six pieces and serve right away,
while the cheese is still nice and melty.
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