I brought these spinach bites to my cooking club as well, but they also lacked any strong flavor. The recipe overall has potential though, and next time I would use a much sharper cheese to see if that makes a difference.
1 (10 oz.) package frozen spinach, thawed and drained
1 c. cheddar cheese
1/2 c. breadcrumbs
1 t Italian seasoning
1 T mustard
2 eggs, well beaten
Mix ingredients and form into balls. Place on a cookie sheet coated with cooking spray. Bake at 375F for 10-15 minutes.