Alsatian Bacon and Onion Tart (Tarte Flambée)

Name: Alsatian Bacon and Onion Tart (Tarte Flambée)
Cuisine: European, Mediterranean, French
Ingredients: 1⁄2 cup crème fraîche; 1 cup fromage blanc (available at Murray's Cheese) 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