Pre heat oven to 425 degrees
Heat up pan with 1 T of oil
add onions and cook until translucent
1 large onion chopped
add sausage and brown (use spatula to chop into small pieces)
19 oz Johnsonville Irish O'Garlic Sausage
add peas and carrots and continue to brown for 2 minutes
16 oz frozen peas and carrots
add rest of ingredients except corn starch and cold water, and bring to simmer
1 clove garlic chopped, 1 tsp whisky or more, 1 tsp Worchestershire, ½ tsp rosemary, 1 tsp sage, 1 tsp thyme, 1 tsp Umami, 1 tsp kosher salt, 1½ cups beef stock, ½ cup water
simmer for 10-15 minutes, and add corn starch slurry (mix corn starch with cold water)
2 tsp corn starch, 2 tbsp cold water
simmer until mixture thickens around 2-3 minutes
place filling in 13X19 baking dish
place mashed potatoes on top of filling and bake for 25 minutes
let cool, serve and enjoy!