Oven Baked 3-Ingredient Chicken Marengo

There’s something wonderful about a recipe that turns a handful of humble ingredients into a dinner that tastes like you spent much longer in the kitchen.

This Oven Baked 3-Ingredient Chicken Marengo is exactly that kind of meal. Tender chicken is baked in a savory tomato sauce until juicy, flavorful, and wonderfully comforting. With just three main ingredients, it’s an easy dinner for those nights when you want something homemade without making a complicated recipe.

Traditional Chicken Marengo is a French dish associated with the Battle of Marengo and is often made with additional ingredients such as mushrooms, wine, tomatoes, herbs, and sometimes eggs or seafood. This version is intentionally simplified into an easy 3-ingredient, oven-baked adaptation.

It’s the sort of recipe that works beautifully for a busy weeknight: mix, bake, and let the oven take care of the rest.

❤️ Why You’ll Love This Recipe
Only 3 main ingredients
Easy oven-baked dinner
Minimal preparation
Budget-friendly
Tender, juicy chicken
Rich tomato flavor
Family-friendly
Perfect for busy weeknights
Great served over rice or pasta
Easy to customize
📋 Recipe Information

Prep Time: 10 minutes
Cook Time: 35–45 minutes
Total Time: 45–55 minutes
Servings: 4
Course: Dinner, Main Dish
Cuisine: French-Inspired
Difficulty: Easy

Ingredients
The 3 Main Ingredients
2 pounds boneless, skinless chicken thighs
2 cups tomato sauce
1 cup sliced mushrooms
Optional Seasoning
Salt, to taste
Black pepper, to taste
½ teaspoon garlic powder
Fresh parsley for serving

For a strict three-ingredient version, simply leave out the optional seasonings and garnish.

🍳 Equipment Needed
9×13-inch baking dish
Mixing bowl
Cutting board
Sharp knife
Aluminum foil
Tongs
👩‍🍳 How to Make Oven Baked 3-Ingredient Chicken Marengo
Step 1: Preheat the Oven

Preheat your oven to 375°F (190°C).

Lightly grease a 9×13-inch baking dish.

Step 2: Prepare the Chicken

Pat the chicken thighs dry with paper towels.

Arrange them in the prepared baking dish in a single layer.

Season with a little salt and pepper if desired.

Chicken thighs are especially good for this recipe because they stay tender and juicy while baking.

Step 3: Add the Mushrooms

Scatter the sliced mushrooms evenly around and over the chicken.

Try to keep the pieces relatively similar in size so they cook evenly.

Step 4: Add the Tomato Sauce

Pour the tomato sauce over the chicken and mushrooms.

Use the back of a spoon to spread the sauce evenly so that most of the chicken is coated.

Step 5: Cover and Bake

Cover the baking dish tightly with aluminum foil.

Bake for 25–30 minutes.

The covered baking time allows the chicken to cook gently while the mushrooms soften and release their flavor into the tomato sauce.

Step 6: Uncover and Finish Baking

Remove the foil and continue baking for another 10–15 minutes.

The sauce should be bubbling around the chicken, and the chicken should reach an internal temperature of 165°F (74°C) at the thickest part.

For a slightly more concentrated sauce, leave the dish uncovered for the full final 15 minutes.

Step 7: Rest and Serve

Remove the dish from the oven and let the chicken rest for about 5 minutes.

Spoon plenty of the tomato-mushroom sauce over each piece of chicken.

Serve hot.

💡 Tips for Success
Use Chicken Thighs

Boneless thighs are forgiving and stay moist during baking. Chicken breasts can also be used, but check them earlier so they don’t overcook.

Don’t Slice the Mushrooms Too Thin

Medium-thick slices hold their texture better while baking.

Choose a Good Tomato Sauce

Because there are only three main ingredients, the tomato sauce makes a big difference. Use one you enjoy the flavor of.

Cover First, Then Uncover

Starting covered helps keep the chicken moist. Finishing uncovered allows excess moisture to evaporate and concentrates the sauce.

Check the Temperature

Chicken is safely cooked when the thickest part reaches 165°F (74°C).

🌟 Easy Variations
Classic-Inspired Chicken Marengo

For a version closer to traditional Chicken Marengo, add garlic, herbs, white wine, and additional mushrooms.

Cheesy Chicken Marengo

Sprinkle mozzarella or Parmesan over the chicken during the final few minutes of baking.

Garlic Herb Version

Add minced garlic, Italian seasoning, or fresh parsley for additional flavor.

Spicy Chicken Marengo

Add crushed red pepper flakes or a little cayenne to the tomato sauce.

Chicken Breast Marengo

Use boneless chicken breasts instead of thighs. Adjust the baking time according to thickness.

🍽️ What to Serve With Chicken Marengo

The tomato-mushroom sauce is perfect for spooning over something that can soak up all those delicious juices.

Starchy Sides
White rice
Buttered egg noodles
Pasta
Mashed potatoes
Crusty French bread
Vegetable Sides
Green beans
Roasted broccoli
Zucchini
Sautéed spinach
Simple green salad

For an especially easy dinner, serve it over warm rice with a simple green vegetable on the side.

🥡 Storage Instructions
Refrigerator

Transfer cooled leftovers to an airtight container and refrigerate for up to 4 days.

Reheating

Reheat gently in the microwave or in a covered skillet over medium-low heat.

Add a splash of water or broth if the tomato sauce has become too thick.

Freezer

Freeze the cooled chicken and sauce in airtight freezer-safe containers for up to 2 months.

Thaw overnight in the refrigerator before reheating.

📊 Approximate Nutrition Per Serving
Calories: 390
Protein: 43g
Fat: 17g
Carbohydrates: 12g
Fiber: 3g
Net Carbs: 9g
Sodium: 620mg

Nutrition information is approximate and will vary depending on the chicken, tomato sauce, mushrooms, and portion sizes used.

❓ Frequently Asked Questions

What is Chicken Marengo?

Chicken Marengo is a French dish traditionally associated with Napoleon’s victory at the Battle of Marengo in 1800. Classic versions are considerably more elaborate than this simplified baked adaptation.

Is this an authentic Chicken Marengo recipe?

This is best described as a 3-ingredient, oven-baked adaptation inspired by Chicken Marengo, rather than a traditional preparation. The simplified recipe focuses on chicken, tomato sauce, and mushrooms.

Can I use chicken breasts?

Yes. Chicken breasts work well, although they can dry out more easily than thighs. Use similarly sized pieces and check their temperature toward the earlier end of the cooking time.

Can I use fresh tomatoes?

Yes, although fresh tomatoes will produce a thinner and less concentrated sauce. Canned tomato sauce is more convenient for this particular recipe.

Can I leave out the mushrooms?

Absolutely. If you want exactly three ingredients but don’t enjoy mushrooms, you can substitute another ingredient or simply make chicken baked in tomato sauce. The result will be less like Marengo but still delicious.

Can I add cheese?

Yes. Parmesan, mozzarella, or Gruyère can be sprinkled over the chicken during the last 5 minutes of baking.

Can I make this ahead?

Yes. Assemble the chicken, mushrooms, and sauce, cover, and refrigerate until you’re ready to bake. For best results, bake within 24 hours and allow a little additional cooking time if the dish is very cold.

💚 Final Thoughts

This Oven Baked 3-Ingredient Chicken Marengo takes the comforting flavors associated with Chicken Marengo and turns them into an incredibly approachable weeknight meal.

Tender chicken, earthy mushrooms, and savory tomato sauce bake together in one dish with very little hands-on work. It’s simple enough for a busy evening but satisfying enough to make everyone think you put in much more effort.

Serve it over rice, pasta, or mashed potatoes, spoon the extra sauce over everything, and enjoy a warm homemade dinner without the fuss.