Make bruschetta: combine all ingredients in a medium bowl and season with salt and pepper.
Form beef into 4 equally sized patties and season all over with garlic powder, salt, and pepper.
Make garlic sauce: in a medium skillet over medium heat, melt butter. Add garlic, and cook until fragrant, 1 to 2 minutes. Add flour and cook until no longer raw, 1 to 2 minutes more. Add milk, bring up to a simmer, and cook until thickened slightly, 2 to 3 minutes. (It should be gravy-like in consistency!) Then add cream cheese and cheeses and stir until they have melted completely and mixture is smooth. Season with salt and pepper and remove from heat.
Prep buns: brush cut side of buns with butter and toast in a large skillet over medium heat until golden. Rub cut side of garlic clove on toasted buns.
Heat a grill pan, large skillet, or grill over medium-high heat. Add burgers and grill until charred, about 4 minutes. Flip and cook until cooked to your liking, about 4 minutes more for medium.
Build burgers: place a handful of arugula on bottom bun, then top with burger, cheese sauce, bruschetta, and top bun.
Recipe by The Best Video Recipes for All at https://recipes-for-all.com/garlic-lovers-burger/