Preheat oven to 350°F (177°C). Place the oven rack in the upper-middle position so the top of the baking sheet will be at least 5 inches below the broiler element.
Arrange the 4 slices of sandwich bread in a single layer on a broiler-safe, ungreased, unlined baking sheet.
In a medium bowl, combine 1/4 cup (56 g) softened salted butter, 1/4 cup (50 g) granulated sugar, 1 teaspoon ground cinnamon, and 1/2 teaspoon vanilla extract. Use a fork to stir until the mixture is smooth and uniform in color.
Divide the cinnamon-butter mixture evenly among the 4 bread slices and spread it edge to edge on each slice.
Place the baking sheet on the prepared rack and bake at 350°F for about 10 minutes, or until the bread is lightly crispy.
Switch the oven to the broiler on high. Broil the toast for 1 to 2 minutes, watching constantly, until the cinnamon sugar is bubbling and lightly browned. If the edges begin to burn, remove the baking sheet immediately. Do not leave the broiler unattended.
Remove the toast from the oven and let cool slightly before serving. Enjoy.
Notes
Notes
*If using unsalted butter, add 1/8 teaspoon table salt along with the sugar and cinnamon.
*Most sliced sandwich breads will work just fine here. Hearty wheat bread is particularly good.