Step 1

In a large pot of boiling salted water, boil potatoes about 15 minutes, or until fork-tender; drain. Mash potatoes and set aside.

Step 2

Meanwhile, in a large skillet over medium-high heat, brown beef until no pink remains; drain off excess fat. Remove beef to a bowl and set aside. In the same skillet, over medium heat, melt 1/2 cup butter; saute onions and carrots until tender. Add beef to skillet, then add broth, Worcestershire sauce, and seasoned salt. Slowly stir in mixed vegetables until ingredients are thoroughly combined. Simmer about 5 minutes.

Step 3

Mix remaining butter and the milk with the mashed potatoes.

Step 4

Preheat oven to 375 degrees F. Coat a large casserole dish with cooking spray. Pour contents of skillet into prepared casserole dish. Spread mashed potatoes evenly over top.

Step 5

Bake 35 to 40 minutes, or until potatoes have begun to brown slightly. Remove from oven and let set 5 minutes before serving.