Brown beef until only slightly pink remaining, drain off fat, then add onion and finish browning and until onions are tender.
Add salt, pepper, and garlic powder to taste.
Prepare gravy (according to directions on cornstarch packaging)
Add rosemary seasoning and mix well. Then add gravy to the meat mixture.
Mashed Potatoes
Prepare mashed potatoes and add softened cream cheese to very warm to hot potatoes.
Blend well and set aside.
Layering Shepherd's Pie
Thaw frozen veggies if desired, otherwise add into 9x13 dish.
Pour meat and gravy over veggies.
Spoon mashed potatoes over the meat layer.
Cover with foil. Place on a shallow baking dish to catch drips.
Bake at 350°F/175°C for 40-45 minutes or until heated thru.
Remove foil and add cheddar cheese on top. Melt til bubbly and/or crispy as desired.
Rosemary Herb Seasoning Blend
If the rosemary is too twiggy, crush it up a bit with a blender or spice grinder and pulse a few times. Also fine to leave as is.
Blend all seasonings by placing in a small rubbermaid container and shake to mix.
Notes
Save on baking time by thawing veggies first.
To really speed the process up, cook veggies in microwave. Then add hot meat and gravy mixture on top, and layer on hot mashed potatoes. Put the cheese on and toss the pan in the broiler oven to melt cheese.
Place a cookie sheet on the rack below your dish to catch drips.