Tasty (and very Swiss-French) White Pizza

This is my attempt at imitating a pizza I've seen on to go menus here. It's not anything like pizzas I've seen on American menus, but it's really good! The real Swiss-French version of course includes lardons, i.e. bacon. But I don't eat a lot of meat, and I especially try to avoid pork (paranoid about tapeworms).

Ingredients:
Ready made pizza dough or pizza shell
Creme fraiche or sour cream (about 1/4 c)
2 medium mushrooms, washed and sliced
1 medium potato, baked
3 cloves of garlic, diced
1 small onion, sliced thinly
1/2 c shredded Gruyere cheese

Method:
Preheat oven according to instructions for your dough/shell. You can certainly use home-made dough if you want. Place the dough on whatever you'll cook it on. Cover with the creme fraiche, leaving the amount of crust you prefer along the border. Sprinkle with the garlic. Sprinkle about 1/3 of the cheese on top. Arrange on the pizza: onion slices, mushroom slices and slices of the baked potato. Now sprinkle with the remaining Gruyere. Bake until crust is done, it will be enough time for the cheese to get melty and parts of the pizza to be golden brown.

Notes: I can't tell you how tasty this was! Of course you can add more garlic or mushrooms. That's never a bad thing. I also think it would be tasty with wild mushrooms, but I just used champignons de paris (standard button type).

Serving Suggestion: This was eaten for dinner, but I want to try it for a dinner party as an appetizer, cut into small squares.