Slow Cooked Steak Diane Casserole–an easy crockpot dinner made with tender beef, red potatoes and mushrooms in a rich gravy that’s finished off with a splash of cream.

Slow Cooked Steak Diane Casserole
This is one of those good old-fashioned meat and potatoes dinners that really hits the spot! The Dijon mustard, Worcestershire sauce and mushrooms give the gravy a classic Steak Diane flavor. Greg and I both loved this dish! You can easily double this recipe if you’re serving a crowd. A perfect meal for a chilly fall evening. Enjoy!
Ingredients/Substitution Ideas
- Beef stew meat–or a chuck roast cut into bite-sized cubes
- Flour
- Kosher salt
- Black pepper
- Garlic powder
- Onion powder
- Mushrooms–white button or baby bella
- Beef broth–or beef bouillon mixed with water
- Dijon mustard–or spicy brown mustard
- Worcestershire sauce
- Tomato paste
- Red potatoes–or Yukon Gold potatoes
- Heavy cream–or half-and-half for a lighter sauce
- Frozen peas–or frozen mixed vegetables
Steps
Add beef, flour, salt, pepper, garlic powder and onion powder into slow cooker and stir to coat the meat in the flour and spices.

Stir in the mushrooms, broth, Dijon, Worcestershire, tomato paste and potatoes.

Cover slow cooker and cook on high for 3-4 hours, or on low for 5-6 hours, or until meat is tender.

Stir in the heavy cream and peas, if using.

Salt and pepper to taste. Serve and enjoy!

Notes/Tips
- Serve with a slice of crusty bread.
- Add in more veggies. Try stirring in frozen peas or frozen mixed veggies.
- If you like lots of gravy, increase the beef broth by ½ cup. Keep in mind that this will also thin the sauce slightly.
- This can be gluten free if you use gluten free Worcestershire sauce and a gluten free flour blend.
- Store leftovers in an airtight container* in the refrigerator for 4 days. Freeze leftovers for up to 3 months.
- Other recipes you can make with tomato paste are Catenzaro’s Casserole and Instant Pot Mexican Pulled Pork.
- Tools:
- I used a 6 quart slow cooker. You can also make this in an 8 quart slow cooker.
- Knife*
- Cutting board*
- Magnetic measuring spoons*
- Glass measuring cup*
Did you know you can filter the recipes on my website to search by meat type, IP or Crockpot, low carb, gluten free, etc.? Use the filter to find exactly what you are looking for.


Slow Cooked Steak Diane Casserole
- Prep Time: 20 minutes
- Total Time: 20 minutes
- Yield: 3–4 servings 1x
Description
An easy crockpot dinner made with tender beef, red potatoes and mushrooms in a rich gravy that’s finished off with a splash of cream.
Ingredients
- 16 oz beef stew meat
- 2 Tbsp flour
- 1 tsp kosher salt
- 1/2 tsp black pepper
- 1 tsp garlic powder
- 1 tsp onion powder
- 4 oz quartered mushrooms
- 1 cup beef broth
- 1 Tbsp Dijon mustard
- 1 Tbsp Worcestershire sauce
- 1 Tbsp tomato paste
- 20 oz red potatoes, quartered
- 1/4 cup heavy cream
- 1/2 cup peas, optional
- Extra salt and pepper to taste
Instructions
- Add beef, flour, salt, pepper, garlic powder and onion powder into slow cooker and stir to coat the meat in the flour and spices.
- Stir in the mushrooms, broth, Dijon, Worcestershire, tomato paste and potatoes.
- Cover slow cooker and cook on high for 3-4 hours, or on low for 5-6 hours, or until meat is tender.
- Stir in the heavy cream and peas, if using.
- Salt and pepper to taste.
- Serve and enjoy!
- Category: Beef
- Method: Slow Cooking

More Beef recipes…
Tennessee Barbeque Beef
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Crock Pot Vegetable Beef Soup
This cozy soup has tender potatoes, mixed vegetables, tomatoes and savory ground beef and can be made in the Instant Pot or slow cooker.
Cheesy Beef Enchilada Tortellini
An easy dinner made with ground beef, cheese tortellini, red enchilada sauce and melty cheese, make it in the slow cooker or Instant Pot.
Beef + Vegetables = A Perfect 20 Minute Satisfying Dinner
A quick 20-minute dinner made with tender strips of sirloin, crisp vegetables and a simple savory soy sauce.
*Karen Petersen is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.





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