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In a large skillet, melt 1 Tbs butter over medium high heat.
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Add the shrimp and garlic.
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Cook, tossing, until the shrimp starts to turn pink on the outside but is stil translucent on the inside, about 2 min (the shrimp will finish cooking later.).
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Transfer to a plate and set aside.
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Reduce the heat to medium and in the same skillet, melt the remaining butter.
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Add the shallot and cook until softened, 1-2 minute.
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Add the flour and cook for 30 secs, whisking constantly.
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Gradually add the wine, broth, and mustard - whisking constantly.
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Simmer until it is as thick as heavy cream, about 5 minute.
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Return the shrimp to the skillet.
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Bring to a simmer and cook until the shrimp are opaque throughout, about 2 minute.
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Season with salt and pepper to taste.