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Instructions
1. Roast the Onions
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Preheat oven to 450°F (230°C). Lightly grease a baking dish with olive oil.
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Arrange onion slices in a single layer. Drizzle with olive oil, then sprinkle with thyme, salt, and pepper.
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Roast for 20 minutes, or until the onions begin to soften and caramelize at the edges.
2. Make the Cream Sauce
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In a small saucepan, warm the heavy cream over medium heat until it just begins to simmer.
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Whisk in the Dijon mustard and ¼ cup of Asiago cheese until melted and smooth.
3. Assemble & Bake
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Remove onions from the oven and pour the cream sauce evenly over them.
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Sprinkle the remaining ¼ cup of Asiago cheese on top.
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Cover with foil and bake for 20 more minutes, or until bubbly and golden.
4. Serve & Enjoy
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Let rest for 5 minutes before serving. Garnish with extra thyme if desired.
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Pairs beautifully with roasted meats, grilled chicken, or crusty bread.
Tip: For extra richness, broil for 1–2 minutes at the end for a crispy cheese topping!
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