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1
Add sliced potatoes to well salted pot of water. Once it starts to boil, boil for three minutes. Do not overcook, drain well.
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2
In a skillet on medium heat, combine the olive oil and onions. Add salt and pepper to taste and cook for 4 - 5 minutes.
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3
Add the parsley, thyme, and ham and cook an additional 3 - 5 minutes then set aside in a bowl.
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4
Wipe skillet out with paper towel and melt the butter over medium heat.
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5
Add the flour and whisk to combine and the flour has turned a slight brown color.
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6
Slowly add the milk and whisk constantly. Add salt and pepper to taste.
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7
Bring to a boil and then turn heat down to low and whisk for another 2 - 3 minutes.
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8
Add the ham and onion mixture to the skillet. Add salt and pepper to taste.
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9
Cook an additional 2 minutes.
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10
Butter a 2 quart casserole dish.
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11
Add a spoonful of sauce and spread on the bottom of the casserole dish.
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12
Place a layer of potatoes on top of the sauce.
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13
Continue alternating sauce and potatoes.
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14
Sprinkle the gruyere cheese on top and then cover with foil.
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15
Bake at 400 degrees for 35 - 55 minutes.
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16
Remove foil and bake another 10 minutes to brown the cheese.
