In
skillet, melt butter over medium heat. Add garlic and cook until softened and fragrant, 1 to 2 minutes. Whisk in flour and cook 1 minute more, then slowly add milk, whisking to break up lumps, and simmer until thickened, 5 minutes. Add
Parmesan and parsley and season with salt and pepper. Add tomatoes and cook until bursting, 2 to 3 minutes.