Bake: Place slices on a parchment-lined baking sheet. Bake in the preheated oven for 20 to 25 minutes or until golden brown and puffed.
Make the Sauce: Meanwhile, make the sauce by mixing together the cream cheese, diced tomatoes, shredded cheddar cheese, and sour cream until smooth.
Serve: Serve the puff pastry appetizers warm with the cream cheese and tomato sauce on the side for dipping.
Enjoy the deliciousness of this secretly simple puff pastry appetizer that will surely keep everyone guessing!