Pan-Seared Bavette Steak with Mushroom Sauce and Caramelized Onion Mashed Potatoes

This bavette steak recipe is all about deep, meaty flavor. The steak is pan-seared to perfection and served with a savory mushroom sauce that’s rich and complex. On the side, creamy mashed potatoes are topped with sweet caramelized onions, and tender roasted carrots add a touch of sweetness.

It’s a complete meal that feels indulgent but is surprisingly simple to make. Perfect for a special dinner or when you want to impress without spending hours in the kitchen.

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Ingredients

1 unit Yellow OnionView ingredient guideLike ingredientDislike ingredient

1 clove GarlicView ingredient guideLike ingredientDislike ingredient

12 ounce CarrotsView ingredient guideLike ingredientDislike ingredient

4 ounce Button MushroomsView ingredient guideLike ingredientDislike ingredient

16 ounce Yukon Gold PotatoesView ingredient guideLike ingredientDislike ingredient

2 tablespoon Sour CreamView ingredient guideLike ingredientDislike ingredient

10 ounce Bavette SteakView ingredient guideLike ingredientDislike ingredient

1 unit Beef Demi-GlaceView ingredient guideLike ingredientDislike ingredient

2 teaspoon Dijon MustardView ingredient guideLike ingredientDislike ingredient

2 tablespoon Vegetable OilView ingredient guideLike ingredientDislike ingredient

1 tablespoon ButterView ingredient guideLike ingredientDislike ingredient

Salt, to tasteView ingredient guideLike ingredientDislike ingredient

Pepper, to tasteView ingredient guideLike ingredientDislike ingredient

1 teaspoon SugarView ingredient guideLike ingredientDislike ingredient

Instructions

1. Preheat oven to 425°F (220°C) with a rack in the top position. Wash and dry all produce. Trim, peel, and cut carrots diagonally into 1-inch pieces. Peel and dice potatoes into ½-inch pieces. Halve, peel, and thinly slice the onion. Trim and thinly slice mushrooms. Peel and mince garlic.
2. Toss carrots on a baking sheet with a drizzle of oil, salt, and pepper. Roast on the top rack until browned and tender, 25–30 minutes. Meanwhile, place potatoes in a medium pot and cover with salted water by 2 inches. Bring to a boil and cook until tender, 15–20 minutes. Drain and return potatoes to the pot. Mash with sour cream until smooth. Season with salt and pepper. Cover and keep warm.
3. While potatoes cook, heat a drizzle of oil in a large pan (preferably nonstick) over medium-high heat. Add onion and cook, stirring occasionally, until browned and softened, 8–10 minutes. Add 1 teaspoon sugar and a splash of water; cook until caramelized, 2–3 minutes more. Season with salt and pepper. Transfer to a small bowl. Wipe out the pan.
4. Pat the steak dry with paper towels and season generously with salt and pepper. Heat a drizzle of oil in the same pan over medium-high heat. Add steak and cook to desired doneness, 5–7 minutes per side for medium-rare. Transfer to a cutting board and let rest.
5. Add 1 tablespoon butter and the mushrooms to the pan over medium-high heat. Cook, stirring, until softened, 3–5 minutes. Add garlic and cook until fragrant, about 30 seconds. Stir in the demi-glace and ¼ cup water. Bring to a boil, then reduce to a simmer. Stir in mustard and simmer until thickened, 2–3 minutes. Season with salt and pepper.
6. Slice the steak against the grain. Divide potatoes, carrots, and steak among plates. Top potatoes with caramelized onions. Spoon mushroom sauce over the steak. Serve immediately.

Useful Cookware

A few helpful kitchen tools for this recipe, with relevant Amazon picks for each item.

Peeler

OXO Good Grips Swivel PeelerView on AmazonSpring Chef Premium Swivel Vegetable Peeler, Soft Grip Handle and Ultra Sharp Stainless Steel Blades - Perfect Kitchen Peeler For Veggie, Fruit, Potato, Carrot, Apple - BlackView on AmazonFUHUY Vegetable, Apple Peelers for kitchen, Fruit, Carrot, Veggie, Potatoes Peeler, Y-Shaped and I-Shaped Stainless Steel Peelers, with Ergonomic Non-Slip Handle & Sharp Blade, Good Sturdy (2PCS)View on Amazon

Baking sheet

GoodCook Everyday Nonstick Baking Sheet Set, 3 Pack Includes Small (13×9) Medium (15×1) and Large (17×11) Pans Carbon Steel Construction Cookie Sheets Bakeware Set, GrayView on AmazonNutriChef 3-Piece Nonstick Kitchen Oven Baking Pans - Premium & Stylish Non-Stick Steel, Commercial Grade Restaurant Quality Metal Bakeware with Red Silicone Handles - Easy to Clean, NCSBS3SView on AmazonNordic Ware Naturals Half Sheet - USA Made Aluminum Commercial Quality Sheet Pan for Baking or Roasting, Encapsulated Galvanized Steel Rim Prevents Warping, 2-PackView on Amazon

Medium pot

Cuisinart 1.5 Quart Sauce Pan with Cover, Stainless Steel Pot with Lid, Small Kitchen Pots, Dishwasher Safe, Compatible with Induction, Electric, Gas Cooktops, Oven Safe Saucepan, Cool Grip HandlesView on AmazonSENSARTE Nonstick Saucepan with Lid, 1.5 Quarts Small Pot with Swiss Granite Coating, Stay-cool Handle, Multipurpose Handy Sauce Pot Small Kitchen Cooking Pot, Induction Comptable, PFOA FreeView on AmazonCAROTE 8QT Full Clad Tri Ply Stainless Steel Stock Pot with Lid, Kitchen Soup Pot, All Stoves Compatible, Oven & Dishwasher Safe, Stay Cool Handle, White, Mothers Day GiftsView on Amazon

Strainer

Cuisinart, Mesh Strainers, Stainless Steel Mesh Strainers for Kitchen, Fine Mesh Kitchen Strainer Set for Sifting, Straining and Cooking, Ctg-00-3Ms, 3 CountView on Amazon3Pcs Super Wire Extra Fine Mesh Strainer with Handle, Small Medium Large Size Sifter Metal Strainer Set, Stainless Steel Sieve Fine Mesh Strainers for Kitchen Rice Juice Quinoa Food Flour Baking YLYLView on AmazonWinco Strainer with Single Fine Mesh, 8-Inch Diameter, Medium, Stainless Steel, Tan,SilverView on Amazon

Potato masher

Chef Craft Select Sturdy Masher, 10.25 inch, Stainless Steel/BlackView on AmazonKitchenAid Gourmet Stainless Steel Wire Masher, 10.24-Inch, BlackView on AmazonUpgraded Potato Masher, Durable Non-break Handle, Rust-proof, Dishwasher safe, Heavy duty 304 Stainless Steel, Kitchen Gadgets Gifts, BlackView on Amazon

Small bowl

Kaytee Stoneware Ceramic Pet Hamster Bowl, Brown, 3-InchView on AmazonDipping Bowls, Soy Sauce Dish Ceramic, 3 OZ Small Serving Bowls for Side Dishes Vintage Blue Stylish Design, Set of 6 Mini Appetizer Plates for Condiment Sushi Ketchup BBQ Party, 4 InchView on AmazonFarielyn-X 3.5in 4oz Small Glass Bowls, Mini Glass Containers, Ramekins, Prep, Pinch Bowl, Stackable Condiment Containers, for Prep, Dips, Nuts, Snacks, Candy Meal Prep Bowls, Dessert BowlsView on Amazon

Large pan (preferably nonstick)

Tramontina Professional 14-Inch Non Stick Extra Large Frying Pan, Heavy-Gauge Aluminum Skillet with Reinforced Nonstick Coating, Red Handle, Dishwasher and Oven SafeView on AmazonCAROTE Non Stick Frying Pan Skillet, Nonstick Granite Fry Pan with Glass Lid, Egg Pan Omelet Pans, Stone Cookware Chef's Pan, PFOA Free (Classic Granite, 10-Inch)View on AmazonBlue Diamond Ceramic Nonstick 14" Frying Pan Skillet, PFAS-Free Cookware, Jumbo Cooker with Helper Handle, For Large & Family Sized Meals, Dishwasher & Oven Safe, BlueView on Amazon

Paper towels

Scott Paper Towels, Choose-A-Sheet, 6 Double Rolls = 12 Regular Rolls (108 Sheets Per Roll)View on AmazonAmazon Basics 2-Ply Flex-Sheets Paper Towels, 12 Basics Rolls = 40 Regular Rolls, Everyday Value with 150 Sheets per Roll, Packaging May VaryView on AmazonBounty Quick-Size Paper Towels, White, 8 Family Triple Rolls = 27 Regular RollsView on Amazon

Recipe Tips

FAQ

Can I use a different cut of steak?

Yes, you can substitute with flank steak or sirloin, but adjust cooking time as needed.

How do I know when the steak is done?

Use a meat thermometer: 130°F (54°C) for medium-rare, 140°F (60°C) for medium. Let rest 5 minutes before slicing.

Can I make this dairy-free?

Yes, use dairy-free sour cream and butter substitutes. The sauce will still be delicious.