In a large bowl, add the warm water and yeast. Stir to combine and allow to sit for about 5 minutes, until foamy. Stir in the orange zest, juice, granulated sugar, salt, egg, butter and 1 1/2 cups of flour.
Using a hand mixer, mix until well-combined, scraping down the sides as necessary. Add the remaining 2 cups of flour and mix with a wooden spoon until the dough is no longer and sticky and has a slight bounce-back if you poke it.
Remove the dough to a lightly floured surface and knead for 5-6 minutes. Shape the dough into a ball and place in a lightly oiled bowl. Cover and allow to rise in a warm place until double in size, about an hour.
Line a 9x13 (or 10-12" round) baking dish with parchment paper or spray with cooking spray and set aside.
Remove dough from the bowl to a lightly floured surface and use a rolling pin to roll into a 10x15-inch rectangle that is even thickness all over.