Cut the bread in half, horizontally. Mix the Cannabutter, garlic, and parsley together in a small bowl. Spread butter mixture over the two bread halves. Place on a sturdy baking pan (one that can handle high temperatures, not a cookie sheet) and heat in the oven for 10 minutes.
Remove pan from oven. Sprinkle shredded cheese over the bread. Return to oven on the highest rack. Broil on high heat for 2-3 minutes until the edges of the bread begin to toast and the cheese (if you are using cheese) bubbles. Watch very carefully while broiling. The bread can easily go from un-toasted to burnt.
Remove from oven, let cool a minute. Remove from pan and make 1-inch thick slices. Serve immediately.