Preheat your skillet over medium heat until it feels warm to the touch, around 160°C (320°F).
In a mixing bowl, whisk together the melted butter, ground cinnamon, and maple syrup until well combined and fragrant.
Place the gluten-free bread slices on a plate and evenly brush or spoon the cinnamon butter mixture onto one side of each slice, ensuring they are generously coated.
Once the skillet is heated, place the coated bread slices in the skillet, cinnamon side down, pressing lightly to help them adhere and contact the pan surface.
Cook for about 3-4 minutes until the edges are golden brown and crispy, and the cinnamon aroma is wafting through the air.
Flip the slices carefully with a spatula and cook for another 3-4 minutes until the other side is equally golden and crispy.
Remove the toast from the skillet and let it rest for a minute to settle and cool slightly.
Serve the cinnamon toast warm, topped with fresh berries or a dollop of yogurt if desired, for added brightness and texture.