Preheat oven to 375 degrees F.
Lightly grease a cookie sheet with non-stick cooking spray.
In a large bowl, place spinach, parmesan, onion, egg, croutons, butter, garlic and Tabasco. Mix well.
Shape spinach mixture into 1-inch balls using hands or a melon baller.
Arrange on cookie sheet spaced 1 inch apart.
Bake, uncovered, at 375 degrees for 15 minutes, until croutons are slightly golden.