Easy Slow Cooker Steak Diane Casserole

A comforting and hearty casserole featuring tender beef and a creamy sauce, perfect for family meals.

Print Recipe

Prep Time 20

Cook Time 3

Servings 6 servings

Calories 450 kcal

Equipment

large casserole pan

Ingredients

Main Ingredients

2 tablespoon oil
3.3 pound braising beef or casserole beef, chopped into bite-sized chunks
3 tablespoon all-purpose flour gluten-free flour can be used if needed
0.5 teaspoon salt
0.5 teaspoon freshly ground black pepper
1 large onion, peeled and chopped
4 clove garlic, peeled and minced
2 tablespoon tomato puree
4 tablespoon brandy or whisky No alcoholic drinks allowed, please substitute with a non-alcoholic option
1 tablespoon Worcestershire sauce
4.25 cup beef stock (3 stock cubes plus water is fine, or use homemade stock or bouillon for gluten-free)
10.5 ounce chestnut mushrooms, thickly sliced
1 tablespoon cornstarch mixed with 3 tbsp cold water optional, for thickening
0.5 cup heavy cream
1 bunch fresh parsley, roughly chopped
1 pinch black pepper

Instructions

Preheat your oven to 320°F (160°C, fan).
In a large casserole pan, heat the oil over high heat.
In a bowl, combine the chopped beef with flour, salt, and pepper. Toss to coat the beef evenly.
Add it to the hot casserole pan. Cook for 6-8 minutes, turning regularly until browned all over.
Once the beef is browned, reduce the heat to medium and add the chopped onion. Cook for an additional 3-4 minutes, stirring regularly until the onion starts to soften.
Stir in the minced garlic and tomato puree, cooking for another minute.
Then, add the brandy/whisky, Worcestershire sauce, beef stock, and sliced mushrooms. Mix everything well, scraping up any bits stuck to the bottom of the pan.
Bring the mixture to a boil. Cover the pan with a lid and transfer it to the oven. Cook for 3 hours, until the beef is tender.
Check occasionally during the last hour to ensure it doesn’t dry out; add a splash of boiling water or stock if needed.
After 3 hours, remove the casserole from the oven. If you prefer a thicker sauce, stir in the cornstarch slurry.
Add the heavy cream and stir well. Top with freshly chopped parsley and a sprinkle of black pepper.
Serve your delicious beef casserole with mashed potatoes and green vegetables like broccoli, green beans, or kale.

Notes

This dish can be made ahead of time and reheated, making it perfect for meal prep! For a heartier dish, consider adding carrots or potatoes to the casserole before baking.