Step-by-Step Instructions
1. Preheat Oven & Prepare Onions
Set your oven to 350°F (175°C). Peel onions and slice into ¼-inch thick rounds, gently separating the rings.
2. Layer the Onions & Butter
Arrange onion rings in an even layer in your baking dish. Dot evenly with butter pats.
3. Mix the Cheesy Sauce
In a bowl, stir together mayonnaise, garlic powder, paprika, pepper, salt, and thyme (if using). Spread evenly over onions.
4. Add the Cheeses
Sprinkle cheddar, mozzarella, and Parmesan evenly on top.
5. Bake to Perfection
Bake uncovered for 40–45 minutes until golden and bubbly. For extra crisp edges, broil 1–2 minutes at the end.
6. Garnish & Serve
Let rest 5 minutes, then sprinkle with fresh parsley and serve warm.
What to Serve With Tennessee Onions
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Juicy grilled steaks or burgers
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BBQ chicken or ribs
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Roasted potatoes
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Fresh green salad for balance
Tips for the Best Results
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Slice onions evenly for even cooking.
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Use full-fat mayo for maximum creaminess.
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For deeper flavor, use smoked paprika instead of regular.
Storage Instructions
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Refrigerator: Store leftovers in an airtight container for up to 4 days.
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Reheat: Warm in a 350°F oven until heated through.
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Freezer: Not recommended — texture may suffer.
Frequently Asked Questions
Q: Can I make this ahead of time?
Yes! Assemble up to 24 hours in advance, cover, and refrigerate. Bake when ready to serve.
Q: Can I use yellow onions instead?
You can, but sweet onions give the best flavor balance.
Q: Is there a lighter version?
Swap in light mayo and reduce the butter — still delicious, just less rich.
Conclusion
Tennessee Onions are proof that you don’t need a deep fryer to make onions shine. They’re buttery, cheesy, and the perfect side for almost any meal. Make them once, and you’ll have friends and family asking for them again and again.
