We're sorry, there seems to be an issue playing this video. Please refresh the page or try again in a moment.If you continue to have issues, please contact us here.
Preheat the oven to 350 degrees F. Spray an 8-by-8-inch flameproof baking dish with cooking spray.
In a skillet over medium heat, melt the butter. Add the onions and saute until translucent, 3 to 4 minutes. Add the flour and stir until combined. Cook 1 to 2 minutes to remove the raw flour taste. Add the garlic, 1 teaspoon salt, 1 teaspoon pepper, the cayenne and mustard powder. Whisk in the milk. Allow to cook and thicken slightly, about 3 minutes. Remove from the heat.
Line the baking dish with a crisscrossed layer of country ham, then a layer of slightly overlapping potatoes, then about 2/3 cup sauce. Repeat the layering until all the ingredients are used. You should have a total of 3 sets of layers, ending with the sauce on top. Top with the Gruyere and cover with foil. Bake until the potatoes are tender, about 1 hour.
Remove the foil and spoon off any fat that has pooled in the baking dish, if needed. Switch the oven to broil and broil until light golden brown, 3 to 5 minutes. Garnish with green onions before serving.
Tools You May Need
Tools You May Need
Price and stock may change after publish date, and we may make money off
these links.
By entering your email address, you agree to our Terms of Use
and acknowledge the Privacy Policy.
Food Network and
its affiliates
may use your email address to provide updates, ads, and offers.
To withdraw your consent or learn more about your rights, see the
Privacy Policy.