Soften the margarine to room temperature
Freeze the bread for 30 minutes
Place the softened margarine in a mixing bowl and beat for 5 minutes. Scrape down the sides of the bowl and whip for 5 additional minutes
Add Parmesan cheese and spices to the margarine and mix on low speed for a short time, then beat with mixer for five minutes
Use rubber spatula to apply a coating of spread on one side of cold bread slice
Heat electric or stovetop griddle to low-medium heat
Place bread, spread side down, on griddle. Listen for sizzling sound as spread caramelizes
Remove toast when golden brown