In a bowl, mix the softened butter, minced garlic, parsley, salt, and olive oil until smooth.

Slice the loaf in half lengthwise and spread the garlic butter generously on both cut sides.

Optional: Sprinkle grated parmesan cheese on top of the buttered bread.

Place the bread halves on a baking sheet, cut-side up, and bake in a preheated oven at 400°F for 10–12 minutes.

Remove from oven, let cool for a minute, slice, and serve warm.