Preheat your oven to 375°F (190°C).
In a large mixing bowl, combine the mayonnaise, shredded Cheddar Jack cheese, grated Parmesan, parsley, seasoned salt, black pepper, and chunky garlic paste. Mix well until creamy.
Place the Texas toast on a baking sheet in a single layer.
Use a spatula to spread the cheesy garlic mixture over each slice of Texas toast, covering evenly.
Bake for 15-20 minutes, or until the cheese is bubbly and golden brown.
Allow to cool slightly, slice into quarters, and serve warm.