Preheat oven to 350 degrees.

In a small bowl combine salt, onion, garlic, oregano, and parsley and set aside. Melt butter in the microwave until completely melted and then combine it with the olive oil. Place bread cubes in a large bowl and pour the butter/oil mixture over the bread cubes making sure to distribute evenly over the cubes in a small drizzle. Don't dump it all in one place. If you do that, a few lucky little bread bits will soak up all the buttery goodness and the rest will get hurt feelings from being left out. Immediately use your hands to toss making sure to coat each bread cube with the butter mixture. Sprinkle the herb mixture over the bread cubes, again, making sure to distribute it evenly and use your hands to coat well.

Spread cubes in a single layer on a baking sheet.

Place in oven and cook for 10-20 minutes, stirring and flipping every 5 minutes so they cook evenly. The time is going to vary depending on the type of bread used and the size of the cubes. The croutons should be golden brown. Generally, they will take 15-20 minutes.

When finished, remove from oven and immediately toss with Parmesan cheese if desired. Let cool completely.. Store in an airtight container.