First, roast the garlic. Preheat the oven to 375ºF. Then, prep garlic bulbs by using a sharp knife to slice off the pointy end. This will expose the garlic cloves.
Place the bulbs of garlic in the baking dish, so that the flat side faces up. Drizzle with olive oil (about 1/2 teaspoon per head). Roast at 375ºF for 20 minutes.
Then, remove the garlic from the oven and flip each bulb of garlic over so that the flat side faces down. Roast for another 20 minutes. Remove from the oven and let cool for 10 minutes before removing from the pan.
Once cool enough to handle with your bare hands, squeeze each bulb of garlic so that each of the cloves pop out of the casing.
Up the temperature on your oven to 400ºF and transfer the roasted garlic into a medium bowl. Then add the softened butter and mix together until combined.
Next add in the mozzarella, cheddar, parmesan, salt, pepper, and parsley and mixture and mix to combine.
Spray another baking sheet with nonstick cooking spray and line it with the Texas toast. You may need to use 2 baking sheets.
Use a knife or spatula to spread about ¼ cup of the cheesy butter mixture onto each slice of bread.
Bake the bread for 7-10 minutes or until golden brown.
Let sit for 3-4 minutes and enjoy!