Preheat the oven to 400°.
If you are making homemade mashed potatoes, put the peeled and quartered potatoes into a large pot, cover with water, bring to a boil, reduce to a simmer, and cook for 20 minutes. Drain the water, add in 4 tablespoons of butter, ½ tsp. salt & ½ tsp. pepper, and a tiny bit of milk. Mask with the tines of a fork or with a potato masher. You don't want them too runny.
Melt 4 tablespoons of butter in a large skillet over medium heat. Add the chopped onions and cook for 7 minutes.
Add in the two cups of veggies. If frozen, saute for 3 minutes, if fresh, saute for 6-7 minutes or until softened.
Add the ground venison to the pan and cook until browned. Do not drain. Deer is lean and doesn't have contain hardly any fat.
Add in the Worcestershire sauce, seasoning, and beef broth.
Bring the broth to a simmer and reduce the heat to low.
Cook uncovered for 5-10 minutes. Add more broth if needed so the meat doesn't dry out.
Pour the meat mixture into a casserole dish or a 9 x 13 baking dish. Spread it out into an even layer.
Spread the Bob Evan's mashed potatoes or homemade mashed potatoes over the meat mixture.
Bake for 20-25 minutes until bubbly. The mashed potatoes should start to brown.
If you want the potatoes to brown more, broil on hi for 1-2 minutes and don't take your eye off of them or they might burn.