To cut calories, you may use butter-flavored cooking spray in place of the butter.
Cook spinach according to directions and drain well. Mix all ingredients except butter and pastry. Refrigerate mixture at least 1 hour.
Open package of dough and cut a strip 2" wide, cutting through all layers. Cover remaining dough with a damp cloth to keep from cracking.
Separate dough so that you have 2 sheets for each triangle. Brush the dough with melted butter and put 1 rounded teaspoon spinach mixture at the top of the strip.
Fold pastry over like folding a flag. Place on well-buttered baking sheet and brush top with butter. Bake at 375 deg. for 20 min. Serve warm.
To freeze the triangles before cooking, butter both sides of triangle and wrap well. Bake when needed.