Brown Beef in a LARGE skillet over medium-high heat. Until meat crumbles.
Remove Ground Beef from pan using a slotted spoon; reserve; 2-3 TBSP drippings in skillet. Reduce heat to Medium.
Add the onion, mushrooms, and garlic to the skillet and saute at medium heat 10 to 11 minutes or until tender.
Add the Ground beef, peas, beef bullion, salt, and pepper into the skillet with the onion and mushrooms.
Sprinkle flour over meat mixture. Increase heat to medium-high and cook, stirring constantly, 1 minute.
Stir in tomatoes breaking up large pieces with a spoon.
Reduce heat to medium and cook, stirring often, 3 minutes or until slightly thickened. It will create its own sauce!
Transfer the mix to a lightly greased 3 qt baking dish or pan.
Spoon Mashed Potatoes evenly over the meat mixture. Smoothing with the back of a spoon. Sprinkle with cheese if you desire!
Bake at 400° for 15 minutes or until thoroughly heated. Let stand 5 minutes before serving.
Gluten Free
Use a gluten free flour and a gluten-free boullion
Dairy Free
Omit the cheese and use a dairy-free mashed potato. That is it.
Notes
Other Veggies
If you prefer a different veggie you could substitute corn or carrots. Whatever your heart desires!
Prep Ahead
Follow the recipe and assemble your shepherds pie. Cover in foil and refrigerate until ready to bake. This is great for making dinner in the morning or the night before. Can be kept in the fridge up to 3 days in advance before baking.
Cook Once Eat Twice
Easily double this recipe and assemble a second shepherds pie in another dish. Wrap tightly and store in the freezer until needed.Freeze up to 1 month. Thaw in fridge 24 hours. Bake at 400° for 40 minutes or until thoroughly heated. Leave the aluminum foil cover on for the first 15 minutes of baking. Then remove to allow potatoes to brown.