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1
Preheat your oven to 325F.
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2
Get a large pot (make sure to use one with a lid) heating over medium/high heat.
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3
Coat the bottom with a thin layer of olive oil.
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4
Add your onions, carrots, celery and some salt and pepper.
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5
Put the lid on and let them sweat out for about 5 minutes or so.
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6
Add your ground beef, mustard, red pepper flakes and thyme.
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7
With a potato masher, break up the meat.
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8
Once the beef has browned, add your garlic, mushrooms and Worcestershire sauce.
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9
Turn the heat to low and cover the pot.
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10
Cook the potatoes (both yams and Russets)... First, peel them, then cut them into chunks and put them into a steamer and steam them for about 10 minutes, until they are fork tender.
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11
Alternatively, you could prick them with a fork, wrap them in a moist paper towel, then throw them in the microwave for about 8 minutes.
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12
In a large bowl, mash the cooked potatoes, sour cream, broth (if youre using it), salt and pepper.
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13
Place the meat and veggie mixture into the bottom of a casserole dish and top with mashed potatoes.
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14
Top with shredded cheese.
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15
Pop it into the oven (uncovered) for about 20 minutes, until the cheese is melted.
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16
Enjoy
