Preheat oven to 375F
melt butter in a sauce pan over medium heat, stir in flour til fully combined. Gradually whisk in cream then milk, bring to a simmer.
Add nutmeg, salt, pepper, thyme and garlic. Reduce heat and simmer for 5 minutes
In a 9xd713 baking dish lay out half the potatoes. Cover with half the cheese and pour in half the sauce. Repeat with other half of ingredients.
Bake in the oven for 1 hour
In a mixing bowl mix together meat, salt, pepper and water. Form into 4 patties about 1/2u2033 thick. Cover and refrigerate for at least an hour
Heat oil in a large skillet, brown patties on both sides then remove from pan and set aside.
Add butter, onions and garlic, season with salt. Saute til onions soften. roughly 3 minutes
Add mushrooms and thyme and saute, stirring frequently for another 5 minutes.
add flour in a thin layer over everything, then stir to combine thoroughly. Cook another 1 minute
stir in beef stock a bit at a time, stopping to combine with flour to avoid lumps.
Bring liquid to a simmer and simmer for 5 minutes
Return patties to the pan, cover and cook another 3 minutes.