Butter one side of all 4 slices of bread using 1 tablespoon of butter.
Place a large skillet over medium high heat and melt the remaining butter.
Place the 4 slices of bread, buttered side down, into the skillet; and grill for about a minute, or until the grilled side turns golden brown.
Flip the bread and arrange 1 slice of cheese on 2 slices of bread. Leave on heat until the cheese is melted and the grilled side turns golden brown.
Remove from skillet and scoop 2 spoonful of guacamole on top of the cheese and arrange 2 slices of bacon, on both slices of bread.
Top them with the two slices of bread without the guacamole and cut in half before serving.