Easy Shepard's Pie

1. Preheat the oven to 400 degrees F.
2. Place the canola oil into a 12-inch saute pan and set over medium high heat. Once the oil shimmers, add the onion and carrots and saute just until they begin to take on color, approximately 3 to 4 minutes.
3. Add the garlic and stir to combine.
4. Add the meat, salt and pepper and cook until browned and cooked through, approximately 3 minutes.
5. Sprinkle the meat with the flour and toss to coat, continuing to cook for another minute.
6. Add the tomato paste, chicken broth, Worcestershire, rosemary, thyme, corn, peas, and stir to combine.
7. Bring to a boil, reduce the heat to low, cover and simmer slowly 10 to 12 minutes or until the sauce is thickened slightly.
8. While the meat mixture is cooking, prepare mashed potatoes in a separate pan, following instructions. 
9. Once potatoes are cooked, mix egg yolk into potatoes
10. Spray an 11x7-inch glass baking dish and spread meat mixture evenly into the dish.
11. Top with the mashed potatoes, starting around the edges to create a seal to prevent the mixture from bubbling up and smooth with a rubber spatula.
12. Bake for 25 minutes or just until the potatoes begin to brown.

Remove to a cooling rack for at least 15 minutes before serving.