In a skillet over medium heat, add the ground beef, diced onion, and minced garlic. Cook until the beef is browned and the onions are translucent, about 10 minutes.

Drain excess fat, then season with salt, black pepper, and Italian seasoning. Stir to combine and remove from heat.

In a bowl, combine the shredded cheddar cheese, softened cream cheese, and sour cream. Mix until well blended.

Preheat your oven to 375°F (190°C).

Spread butter on one side of each slice of bread. Place the unbuttered side down on a baking dish.

Layer the ground beef mixture evenly on top of the bread, then spread the cheese mixture over the beef.

Top with another slice of bread, buttered side up.

Bake in the preheated oven for 15-20 minutes, or until the bread is golden brown and the cheese is bubbly.

Remove from the oven, let cool for a few minutes, then slice and serve warm.