Boil the potatoes until softened, then drain.
Place the cooked potatoes in a large mixing bowl, and mix until creamy.
Add in the cream cheese, and cheddar, then mix until well combined. Then set the bowl to the side.
Drizzle the vegetable oil into a large pan or dutch oven.
Turn the heat to medium.
Once the oil is hot, add in the chicken breast, and cook until done.
Once the chicken is done, remove it from the pan/ or pot, and pour out the liquid as well.
Next add in the ground beef, and brown.
Add in the vegetables, onions, and garlic.
Now add the chicken back into the pot, and stir.
Pour in the tomato paste, then sprinkle in the seasonings.
Stir all the ingredients until well combined, then let cook for another 15 minutes, then turn the heat off.
Preheat your oven to 350 F.
Grease a 9x13 bake dish, then add in meat & vegetable mixture, and smooth it out into a even layer.
Top the meat & veggie mixture with the creamy potato mixture and smooth out.
Leave the shepherds pie uncovered, and bake in the oven for 45-55 minutes.
Remove from the oven, and let sit for 20 minutes.
Serve & enjoy!