In a small bowl, combine granulated sugar with ground cinnamon and mix thoroughly. Set aside.

In a shallow dish, whisk together eggs, milk, and vanilla extract until smooth. Set aside.

Flatten each slice of bread with a rolling pin, spread melted butter on one side, sprinkle with cinnamon-sugar, roll tightly, and secure with a toothpick if needed.

Heat a skillet over medium heat, dip roll-ups in egg mixture, allow excess to drip, then cook seam-side down for 2-3 minutes per side until golden brown.

Once cooked, transfer roll-ups to a serving plate and serve hot with additional cinnamon-sugar or toppings of choice.