Preheat and Prepare: Start by preheating your oven to 350°F (175°C). Line a large baking sheet with parchment paper or lightly spray it with non-stick cooking spray.

Cook the Ground Beef: In a large skillet over medium heat, cook the ground beef and diced onion until the beef is fully browned. Season with salt and pepper. Once cooked, meticulously drain any excess grease from the pan.

Prepare the Dough: On a lightly floured surface, gently roll out the refrigerated French bread dough into a large rectangle, approximately 12×18 inches in size.

Add Condiments: Evenly spread the ketchup and mustard over the dough. Make sure to leave a 1/2-inch bare border around all the edges to ensure a tight seal later.

Layer the Fillings: Evenly distribute the cooked, drained ground beef over the condiments. Sprinkle the crumbled bacon and chopped pickles evenly on top of the beef.

Add Cheese: Place the American cheese slices in a single, overlapping layer over the fillings.

Roll and Seal: Carefully roll up the dough from one of the long ends to the other, gently pressing to seal the edges tightly as you go. Place the rolled dough seam-side down on the prepared baking sheet.

Brush and Bake: Brush the top of the dough with the beaten egg and sprinkle the sesame seeds evenly on top. Bake in the preheated oven for 20-25 minutes, or until the dough is a beautiful golden brown.

Cool and Serve: Allow the bread to cool for at least five minutes before slicing. Serve warm with a side of Thousand Island dressing for dipping!