Alsatian Bacon and Onion Tart

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Ingredients :
1/2 cup crème Fraîche
1 cup fromage blanc or cream cheese at room temperature
1/8 tsp nutmeg, freshly grated
1 tsp kosher salt, plus more to taste
Freshly ground white pepper, to taste
1 3/4 cups flour, plus more for dusting
1 tsp baking powder
3 tbsp olive oil
2 egg yolks
8 strips smoked bacon, finely chopped
1 medium white onion, thinly sliced
Instructions
Heat an oven to 500° with a pizza stone positioned on center rack. Mix crème fraîche, fromage blanc, nutmeg, and salt and white pepper in a bowl. Set aside.
Whisk flour, baking powder, and 1 tsp salt in a bowl; make a well in the center. Whisk oil, yolks, and 1?2 cup water in another bowl, and pour into well.
Using a fork, stir until a loose dough forms. Turn out onto lightly floured surface; knead dough for 1 minute. Divide dough into 3 pieces.
Working with 1 piece of dough at a time, roll into a 12″ circle, and place on a parchment paper-lined baking sheet. Spread 1/2 cup cheese mixture over circle, leaving a 1/2″ border around edge.
Sprinkle with a little of the bacon and onions. Transfer dough (on parchment paper) to pizza stone. Bake until lightly browned and crispy, 8-10 minutes. Repeat.
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