Peel and chop the potatoes.  Bring the water in a steamer to boil, add the potatoes, reduce to medium-high heat and steam for 20 minutes or until potatoes are soft.

In a large oven-safe skillet begin to brown the ground beef over medium heat breaking it into bite sized pieces.

While the potatoes are steaming and the ground beef is browning, begin prepping the vegetables.  Add the prepped veggies to the ground beef and continue to cook.

In a small saucepan add the ingredients for the sauce and whisk together.  Bring to a boil. Reduce heat to low and simmer, whisking continuously. Simmer for 2-3 minutes or until the sauce has thickened.

Add the sauce to the skillet and stir together.

Drain the potatoes and place them in a large mixing bowl.  Add the water and seasonings and begin mashing using a handheld masher or an electric mixer.  Add more water as needed to bring potatoes to desired creaminess.

Spread the mashed potatoes on top of the skillet.  Place the entire skillet in the oven and bake for 15 minutes or until the mashed potatoes are turning golden brown on the edge and the sauce is bubbling.

Remove from oven and serve.