Preheat the oven to 350°F. In a small bowl, combine the butter, sugar, cinnamon, and salt. You'll need the butter to be pretty soft to get it all combined.
Spread the mixture evenly over one side of each of the 4 pieces of bread, being sure to cover all the way up to the edges of the bread. It's going to seem like a lot, but trust me.
Place the bread on a baking sheet and bake it in the preheated oven for 10 minutes.
Next turn the broiler on and broil the toast until it is deep golden brown and the sugar is bubbling. I usually stand right at the oven with the door cracked so I can watch it best and prevent it from burning.
Slice in halves, if desired, and serve.
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Note: Adapted from The Pioneer Woman
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