Turn water on to boil in a medium pot
Peel 3-4 potatoes, chop them into about 1 inch cubes then them to the pot
Preheat oven to 400 degrees F
Season ground beef with salt and pepper, brown in a frying pan on medium heat
Dice 1/2 yellow onion and add to beef as it browns
Dice carrots until you have about 1 cup and add to beef and onion mixture
Cover frying pan with lid for about 5 minutes
Uncover and add 3 tablespoons flour and 1/2 cup water. Stir well to incorporate
Add 2 teaspoons Montreal Steak Spice and stir
Add 1 cup each corn and peas, mix well and leave on medium-low while you do the potatoes
Check if potatoes are cooked by piercing with a fork. Drain and return to pot
Add 1 tablespoon butter, 1/4 cup milk, 1/2 teaspoon garlic salt, 1/ teaspoon seasoning salt to the potatoes and mash until smooth
If you are using a cast iron pan, top the meat filling with the potatoes. If not, transfer the meat filling to an oven safe dish and top with potatoes
Bake for about 10 minutes or until potatoes turn a little golden brown. Broiling will brown the potatoes quicker but don't leave them unsupervised.. broil can burn quickly!