Preheat oven to 375°F, line baking sheet with parchment
Cut bread into ¾-inch cubes, keep uniform size
Combine melted butter and minced garlic in large bowl
Let sit 2-3 minutes for garlic to infuse
Add garlic powder, onion powder, Italian seasoning, parsley, salt, pepper, paprika
Whisk until seasonings evenly distributed
Add bread cubes, toss thoroughly to coat all pieces
Sprinkle Parmesan if using, toss again
Spread in single layer on baking sheet, don't overcrowd
Bake 10 minutes, remove and stir/flip croutons
Bake another 5-8 minutes until golden brown and crispy
Cool completely on baking sheet
Store in airtight container at room temperature