Combine first 9 ingredients in a large bowl; set aside.
Unfold phyllo, and cover with a slightly damp towel to prevent pastry from drying out.
Place 1 sheet of phyllo on a flat surface covered with wax paper; coat with cooking spray. Top with another sheet of phyllo; coat with cooking spray. Cut crosswise into 6 (2 1/2-inch-wide) strips.
Place 1 tablespoon spinach mixture at base of each strip; fold the right bottom corner over to form a triangle. Continue folding back and forth into a triangle, gently pressing corners together.
Place triangles, seam side down, on ungreased baking sheets; coat triangles lightly with cooking spray.
Repeat procedure with remaining phyllo sheets, cooking spray, and spinach mixture.
Bake pastries at 350° for 12 to 14 minutes or until golden. Serve immediately.
Note: Unbaked appetizers may be frozen up to 2 weeks. Freeze on baking sheets until hard; then freeze in airtight containers. Bake, unthawed, as directed above.
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