Butter each of the bread slices with 1 teaspoon butter, spreading all the way to the edges of the bread. Depending on the size of your bread, you may need to use more butter.
Combine sugar and ground cinnamon, and a pinch of salt. Sprinkle over buttered bread. Gently tap bread slice all around to spread sugar mixture over top, coating the butter completely.
Place under broiler and broil 2-3 minutes. Watch carefully as toast can burn easily. Serve warm.