Step 1

Right before cooking, scrub mussels with a stiff sponge or brush under cold running water. (If the "beards" are still attached, trim them with a knife.)

Step 2

While cleaning mussels, discard ones with broken shells. Lightly tap the hinge end of any open shells on a work surface. Discard those that don't close.

Step 3

In a large pot with a lid, melt 1 tablespoon butter over medium-high. Add shallot and garlic. Cook, stirring, until fragrant, 1 minute.

Step 4

Add white wine and chicken broth. Bring to a simmer over high.

Step 5

Add mussels; stir to combine. Cover, reduce heat to medium-high, and cook until mussels open, 5 minutes, stirring once. Discard unopened mussels.

Step 6

Season with salt and pepper. Remove from heat; stir in parsley and remaining butter until butter is melted. Serve with crusty bread.