🧅 Step-by-Step Instructions for the Perfect French Onion Meatloaf
🔪 1. Caramelize the Onions Like a Pro
Start by heating olive oil in a large skillet over medium heat. Add the thinly sliced onions and a pinch of salt. Stir frequently, allowing them to soften and slowly caramelize — this will take around 25–30 minutes. Add a splash of beef broth occasionally to deglaze the pan and enhance the depth of flavor. Once deeply golden and sweet, stir in the minced garlic, cooking for another 2 minutes.
Pro Tip: Don’t rush the caramelization — it’s the heart of the dish’s flavor.
🥣 2. Prepare the Meatloaf Mixture
In a large mixing bowl, combine:
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Ground beef
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Panko breadcrumbs
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Eggs
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Worcestershire sauce
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Dijon mustard
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Fresh thyme
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Salt & pepper
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Half of the caramelized onions
Mix gently with your hands or a spatula until just combined. Avoid overmixing, which can make the loaf dense.
🧱 3. Shape and Bake
Preheat your oven to 375°F (190°C).
Transfer the mixture onto a parchment-lined baking sheet and shape into a loaf. You can also use a loaf pan for a more uniform shape. Bake for 35–40 minutes uncovered.
🧀 4. Prepare Cheese Sauce
While the meatloaf bakes, melt butter in a saucepan, stir in flour to make a roux, and cook for 1–2 minutes. Gradually whisk in milk, followed by the remaining beef broth, and cook until thickened. Remove from heat and stir in shredded mozzarella and Gruyère until smooth and velvety.
🔥 5. Assemble and Broil
Remove the meatloaf from the oven. Top with:
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The remaining caramelized onions
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Generous spoonfuls of cheese sauce
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Extra shredded Gruyère for a bubbly crust
Return to the oven under the broiler for 3–5 minutes, or until golden brown and lightly crisped on top.
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