Tennessee Onions Cheesy Bake

Warm from the oven and bubbling with golden cheese, Tennessee Onions is my go-to side whenever I want to wow my family with almost no effort. Layers of sweet onions mingle with three cheeses and butter until everything melts together into the kind of comfort food people fight over at holiday gatherings. It is better than onion rings and needs nothing but a spoon.

The first time I served this at a backyard cookout it disappeared long before the ribs. This cheesy casserole honestly upstages the main dish.

Gather Your Ingredients

• Onions: Sweet or yellow onions offer mellow flavor and soft texture when baked. Look for firm onions with paper-dry skins
• Butter: Use real unsalted butter for rich taste and that classic melt. Select sweet cream butter for best results
• Salt and Pepper: Essential for enhancing the flavors throughout. Try fresh cracked pepper for a boost
• Italian Seasoning: Gives warmth and a touch of herbal complexity. Choose fresh or high-quality dried blends
• Mozzarella Cheese: Melts smoothly for that stringy goodness. Opt for part-skim mozzarella block for best melt
• Provolone Cheese: Adds depth and a savory note. Use deli-sliced provolone for easy layering
• Parmesan Cheese: Brings a nutty salty crescendos to finish. Grate your own from a wedge for most robust flavor

How to Make It

Preheat the Oven:

Set your oven to 375°F and let it fully preheat. While it is heating up, lightly coat your baking dish in butter to prevent sticking and add extra flavor.

Prepare the Onions:

Peel and slice your onions evenly for uniform cooking. Lay out the slices in a single layer in your dish so each piece gets plenty of cheese and seasoning.

Build the Seasoned Base:

Season the onions generously with salt, pepper, and Italian seasoning. Scatter small pats of butter on top. Make sure every part of the dish gets a touch of seasoning and butter for even flavor.

Add the Cheese Layers:

Sprinkle mozzarella cheese directly over the onions, making sure to fill in gaps. Next, gently drape provolone slices on top to cover the entire surface. Finish by dusting with plenty of freshly grated Parmesan.

Bake to Perfection:

Place the dish uncovered in your preheated oven. Allow the onions to bake for about 25 to 30 minutes. Watch for bubbly cheese and lightly golden edges as your sign it is ready.

Broil for Crunch:

If you love crispy tops, turn on your oven broiler for 2 extra minutes. Be sure to keep an eye on it so the cheese does not burn. The top should be golden and just crisp enough to scoop.

My all-time favorite part is the provolone. When you pull that gooey top layer off the onions underneath are tender and so full of butter and herbs it is irresistible. My kids once argued over the last scoop of onions and now I double the recipe just in case.

Flavor Boosters

If you are out of provolone, try mild white cheddar or Monterey Jack. For a spicier dish, add a sprinkle of crushed red pepper. Another great swap is to use smoked gouda for a rich new twist.

Serving Suggestions

This casserole works as a side for just about any meal. Serve with grilled steak, roast chicken, or pulled pork. For brunch, try it alongside eggs and toast or even as a topper for baked potatoes.

Creative Twists

In spring, use fresh green onions for extra bite and color. During summer, swap in red onions for a milder, sweeter version and top with chopped parsley for freshness. For fall and winter, stick with classic yellow onions for the sweetest flavor.

I learned through trial and error that broiling for just a minute or two at the end gives the dish a golden crust and irresistible aroma.

Common Questions About This Recipe

→ What type of onions work best for this dish?

Sweet or yellow onions are ideal for this bake, as their mild flavor balances the richness of the cheese layers.

→ Can I add extra seasonings?

Yes, you can customize with garlic powder, red pepper flakes, or herbs to enhance the seasoning to your taste.

→ Is it possible to prepare this ahead of time?

Absolutely! Assemble the dish a few hours in advance, refrigerate, and bake just before serving for best results.

→ Which cheeses melt best for a creamy texture?

Mozzarella, provolone, and Parmesan work well together, providing both stretch and flavor. Feel free to substitute similar varieties.

→ Can this be served as a main course?

Though usually a side, it can be enjoyed as a main when paired with a hearty green salad or rustic bread. It’s versatile and filling.