Preheat the oven to 375°F. Spray a large sheet pan with cooking spray. Set aside.
Use a sharp knife to cut the bread into 3/4 inch cubes. Add to a large mixing bowl.
Melt butter in a small microwave safe bowl. To the bowl add the olive oil, Italian seasoning, granulated garlic, onion powder and garlic salt, whisking to combine.
Add the seasoned butter to the cubed bread. Using your hands or a rubber spatula, stir gently until fully coated. Pour onto the prepared pan in a single layer.
Sprinkle the bread with grated Parmesan cheese.
Bake for 15-20 minutes or until golden and crisp, stopping to stir halfway through baking. You can increase the oven temperature and broil at the end to brown further, if desired.
Serve warm or at room temperature on salads, with soup or chili. Yield: 6-8 cups