Mix together 5 grams ripe sourdough starter with 55 grams water and 55 grams flour. Cover and let sit overnight at 78ºF until doubled in size, bubbly and active.

Mix together ripe, bubbly, active levain with water, sugar, salt and bread flour. Mix together with a dough whisk or spoon until a sticky dough forms. Cover and let rest for 30 minutes.

Take the cover off the dough and perform 4-6 coil folds. The dough will be very sticky for this first set of coil folds but will strengthen over time. Wet your hands with water. Place your hands under the middle of the dough and pull up. The dough will stretch up (but should not tear) and release from the bottom of the bowl. Once the dough releases, let the dough fall back under itself. Repeat the process for both sides of dough. Then turn the container and repeat the coil fold. Cover and let rest for 30 minutes.

Wet your hands. You will notice the dough is stronger than your first set of folds. Repeat the coil folds, noticing how the dough is changing and strengthening over time. Cover and rest for 30 minutes.

Wet your hands. Perform 3-4 coil folds. Cover and rest for 30 minutes.

Repeat the last set of coil folds.

Cover with plastic wrap and rest the dough at 78ºF for 2.5-3 hours until the dough has risen about 50-60% in the bowl.

Mix together brown sugar and cinnamon until combined.

After the long bulk rest, line a 9 by 13 (or 12 inch round) metal baking pan with parchment paper. Pour 20 grams light-flavored olive oil in the pan and 25 grams of melted butter. Tip the pan around to coat the entire bottom of the parchment paper.

Dump the focaccia dough into the pan and spread out with your fingers. Pour half to ⅔ of the focaccia filling on top of the focaccia dough. Fold the dough in half and sprinkle the rest of the mixture on the dough. Fold again.

Cover the dough and refrigerate it for up to 48 hours before proceeding with a second proof and baking.

Cover the dough with plastic wrap and let it sit in a warm 78-80ºF place for 2-3 hours until doubled in size, puffed up and very airy.

After the dough is puffed up, jiggly and aerated with air bubbles, gently spread the dough out to fill the edges of the pan. Pour 25 grams of melted butter on top of the dough. Take your fingers and gently dimple the dough.

Pre-heat the oven to 425ºF. Once the oven is pre-heated, bake the focaccia for 25-30 minutes until bubbly, crispy and light golden brown on top and the baked focaccia registers 200ºF. Let cool in the pan for 5-10 minutes before removing to a wire rack.

While the focaccia bakes, whisk together powdered sugar, softened cream cheese, milk, vanilla extract and salt until it forms an icing. Spread over warm focaccia and enjoy!