Step 1: Cook the Sausages

1. Heat olive oil in a large skillet over medium heat.
2. Add the sausages and cook for 8-10 minutes, turning occasionally until browned.
3. Pour in ½ cup of beef broth, cover the pan, and let the sausages cook for another 5 minutes until fully cooked. Remove from heat and set aside.

Step 2: Make the Mashed Potatoes

1. While the sausages are cooking, bring a pot of salted water to a boil.
2. Add peeled and cubed potatoes and boil for 15-20 minutes, or until fork-tender.
3. Drain the potatoes and return them to the pot.
4. Add butter, milk, salt, and black pepper, then mash until smooth and creamy. Set aside and keep warm.

Step 3: Prepare the Onion Gravy

1. In the same skillet used for the sausages, melt butter over medium heat.
2. Add sliced onions and cook for 10 minutes, stirring occasionally, until caramelized.
3. Sprinkle in flour, stirring constantly for 1 minute to create a roux.
4. Slowly pour in beef broth, whisking to prevent lumps.
5. Add Worcestershire sauce and Dijon mustard, then simmer for 5 minutes until thickened.
6. Taste and adjust seasoning with salt and pepper as needed.

Step 4: Assemble and Serve

1. Divide the mashed potatoes onto serving plates.
2. Place the cooked sausages on top.
3. Generously drizzle with onion gravy.
4. Garnish with fresh parsley (optional) and serve hot!