Start by setting your moose chops out 30 minutes before cooking.
Preheat a 10-12" cast iron skillet on medium-high heat with a dash of oil until it starts to shimmer.
While your skillet is heating up, season both sides of the meat with salt and pepper. Then, carefully add the moose chops to the skillet. Cook each side for 2 minutes or until nicely browned.
Remove the chops from the skillet.
Reduce the heat to medium, and melt your butter. Then add the diced onion and minced garlic to the skillet and saute until they're soft.
Next, whisk in the flour. Then add the remaining ingredients: beef broth, Dijon mustard, Worcestershire sauce, and milk. Whisk together well.
Bring the sauce to a simmer before adding the chops back in. Then, reduce the heat to simmer and cook for about 5-10 minutes or until the moose chops are cooked through.