Add the yeast to the warm water, stirring to dissolve. Then add 2 eggs
, half the sugar and mix well. Add 1/2 cup of the flour, stirring to mix well, and adding a bit more if necessary to form a small ball of starter dough. Add half the butter, mixing to incorporate, then place the starter
dough in into a lightly floured mixing bowl. Cover the bowl with a damp kitchen towel, and place in a warm spot (like above the refrigerator). Let the starter rest for 1 hour.
Place the dough
into a mixer
with a hook attachment. Add the remaining flour, the remaining sugar, and the remaining butter. Add the salt, and 1 egg yolk and mix again on medium for 10 minutes. Let the resulting dough rest, covered, for 5 hours.
Preheat the oven to 350 degrees F.
Lightly butter and flour a 9-inch springform pan
. On a lightly floured surface, gently roll the dough out to a 8-inch circle, about 1/2-inch thick. Gently lay the dough into the center of the pan, leaving a slight border all the way around between the dough and the pan sides.
Using a fork, whisk
the remaining 1 egg yolk and add 1/2 teaspoon of extra-virgin olive oil
. Lightly brush the egg wash
over the top of the dough. Sprinkle the almond slices over the top and place the pan in the oven. Bake until the "pizza
" is a light golden brown, about 1 hour. Garnish with powdered sugar and serve.