Preheat oven to 350°F (175°C).

Roll out the bread dough into a rectangle shape.

Scramble the egg in a small bowl.

Brush the scrambled egg evenly over the rolled-out dough.

Lay the fresh spinach leaves on top of the egg-washed dough.

Place pepperoni slices over the spinach.

Sprinkle mozzarella cheese evenly over the pepperoni.

Carefully roll the dough into a loaf shape, starting from one end.

Place the rolled loaf onto a cookie sheet.

Brush the top of the loaf with melted butter or margarine.

Bake in the preheated oven for 28 to 30 minutes, or until golden brown.