01 -
With rack in middle position, preheat oven to 425°F.
02 -
With an immersion blender, beat butter and mayonnaise, or stir well with a fork until smooth. Stir in salt, minced garlic, oregano, garlic powder, red pepper flakes (if using), and Parmesan cheese.
03 -
Slice bread horizontally through the middle into two halves. Place on a baking sheet.
04 -
Spread each bread half with half of the butter mixture.
05 -
Place in preheated oven for 10 minutes. Then turn on broiler to high and let bread turn golden. Watch carefully as this only takes a few minutes.
06 -
Remove bread from oven and, using kitchen shears, cut bread into slices. Serve while warm.