Remove dough from fridge & lightly dust a work surface with all purpose flour. Grease two loaf pans generously with butter, and optionally line the bottoms with a layer of parchment to further prevent sticking.
Scrape out dough onto the floured surface, and using a bench scraper or knife, divide into 16 55 gram (2 oz) pieces, setting aside as you divide the rest of the dough.
To shape into rounds, remove excess flour from the work surface - you want just enough to prevent major sticking and dough tears, but retain some traction to help provide tension during the process.
Take once piece of dough, and place your dominant hand over it, cupping it with confidence but not squishing it. Gently press on it, and make clockwise circles to tighten the dough ball. You will gradually release the pressure as the dough ball tightens. There should be a tightness to the final ball, but it shouldn't be flat or torn. If the dough sticks too much to the surface while rolling, very lightly re-flour. The right amount of flour is important - too much and the dough won't have traction, and too little the dough will stick and tear.
Repeat with the remaining 15 balls, and place the balls into the generously buttered and optionally parchment-bottom lined baking tins, each tin having two rows of 4 balls. The balls will touch each other, but not be overly cramped.
Mix egg wash by whisking egg and water/milk/cream together, optionally straining.
Lightly brush the surface of the balls with egg wash, and place tins uncovered in a warm (70F to 76F) area, away from drafts or major temperature shifts. You can optionally spray the dough balls very lightly with water if you have a spray bottle, or place the dough balls in a humid area (such as an oven with a pot of hot water) to help keep them moist and prevent a skin from forming (which will hinder oven spring during baking).
Allow the brioche to double in volume. This will take approximately 1 to 1.5 hours, depending on the temperature during final proofing. About 30 to 40 minutes into final proofing, pre-heat oven to 350F with racks placed in the center. Remove any racks above the center rack, as the brioche will rise during baking.
Right before baking, very gently brush the brioche again with egg wash. Place in the oven, and bake the loaves until the brioche is a deep golden brown, and a tester or knife inserted into the center of the loaf comes out clean - about 25 to 30 minutes. Properly baked brioche will have a firm, golden crust that holds its shape.
Allow to cool slightly before un-molding from the tin, using a thin knife or off-set spatula to help release any stuck areas. Store brioche at room temperature, only packaging once completely cooled. Baked brioche can be tightly wrapped once cooled, and frozen for about 4 to 6 weeks. To thaw, unwrap and allow to sit at room temperature. Refresh loaves by placing in a 350F oven for 5 minutes.