In 10-inch skillet, cook beef and onion over medium-high heat 5 to 7 minutes, stirring occasionally, until beef is thoroughly cooked; drain.
Stir spinach, parsley, salt, pepper and all but ½ cup of the tomatoes into beef mixture.
Cook and stir until hot; set aside.
Cover phyllo sheets with damp paper towel.
Arrange sheets, layering 3 at a time, in an X shape and then in a plus-sign (+) shape to create a spoke pattern on work surface, brushing each with butter and sprinkling with 1 teaspoon of the bread crumbs as it is added.
Transfer all layers of phyllo to pie plate, gently easing down sides of pie plate and allowing excess phyllo to hang over edge.
Place beef mixture in phyllo; top with cheese.
Fold overhanging phyllo up and over filling, leaving 2- to 3-inch center of filling uncovered.
Spoon remaining ½ cup tomatoes in center.
Brush phyllo with remaining butter.
Bake 40 to 50 minutes or until phyllo is golden brown.
Let stand 5 minutes before serving.
Notes / Tips / Wine Advice:
Quick Variation:For a more authentic Greek flavor, substitute ground lamb for the ground beef.