Ingredients

1 tablespoon butter1/3 cup finely chopped onion1 package (10 ounces) frozen chopped spinach, thawed and squeezed dry1 cup grated Parmesan cheese3/4 cup shredded part-skim mozzarella cheese3 tablespoons crumbled feta cheese2 large eggs, lightly beaten2 tablespoons soft bread crumbs1/4 teaspoon salt1/4 teaspoon pepper12 sheets phyllo dough (14x9 inches)Butter-flavored cooking spray

Preparation

Preheat oven to 375°. In a large skillet, heat butter over medium-high heat. Add onion; cook and stir until tender. Add spinach; cook and stir 3-4 minutes longer or until liquid is evaporated. Transfer to a bowl; cool slightly. Stir in cheeses, eggs, bread crumbs, salt and pepper.

Place one sheet of phyllo dough on a work surface; spritz with cooking spray. (Keep remaining phyllo covered with plastic wrap and a damp towel to prevent it from drying out.) Cut sheet crosswise into four 9x3-1/2-in. strips.

Place 1 tablespoon filling on one end of each strip. Fold dough over filling, forming a triangle. Fold triangle over, forming another triangle. Continue folding, like a flag, until you reach the end of the strip. Spritz end of dough with cooking spray and press onto triangle to seal. Turn triangle and spritz top with cooking spray. Repeat with remaining phyllo and filling.

Place triangles on baking sheets coated with cooking spray. Bake 10-12 minutes or until golden brown.