Gluten-Free Croque Madame

Ingredients:

8 slices gluten-free bread
4 tablespoons unsalted butter, softened
4 slices ham
4 large eggs
1 1/2 cups shredded Gruyère cheese
1 cup milk
2 tablespoons gluten-free flour
1 tablespoon Dijon mustard
Salt and pepper to taste
Directions:
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