Melt butter in a saucepan over low heat, add flour, and cook, stirring constantly for two minutes. Slowly add milk stirring constantly until the mixture is smooth and thick, about 4 minutes. Remove from heat and whisk in Silver Spring Whole Grain Mustard. Add salt and pepper to taste.
Preheat oven to 425 degrees F. Spread all 8 slices of bread with sauce mixture all the way to the edges of the bread.
Place four slices, sauce side up on a parchment-lined pan. Top with ham and half of the grated gruyere.
Add the remaining four slices, sauce side up, on top of the ham and cheese. Top with remaining cheese.
Bake for 10-15 minutes or until the cheese is brown and bubbling.
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