Ground Beef and Twice-Baked Potato Pie

1 Lb. lean ground beef
1/4 c. Chopped onion
1/4 c. plain bread crumbs
1/2 tsp. dried sage leaves
1/2 tsp. salt
1 egg
1 pkg. instant mashed potatoes, or 5 medium potatoes made into mashed potatoes
1 c. shredded cheddar cheese
1/4 c. chopped fresh tomato, if desired
2 slices of precooked bacon, chopped, if desired
2 med. green onions, chopped, if desired

Heat oven to 350*F. In a large bowl mix beef, onion, bread crumbs, sage, salt, and egg until well blended. Press into bottom of ungreased 8 in. square (2 Quart) glass baking dish. Spread mashed potatoes evenly over top. Sprinkle evenly with cheese.
Bake uncovered about 50 mins. or until meat thermometer inserted into the center of beef mixture reads 160*F. Remove from oven. Sprinkle with tomato, bacon, and green onions.