Brenda Gantt Vidalia Onion Casserole
- Prep 20 min
- Cook 30 min
- Total 50 min
- Serves 8
- Level Easy
About Brenda Gantt’s Vidalia Onion Casserole
Brenda Gantt is a Southern home cook from Andalusia, Alabama, known for unhurried cooking videos built on simple pantry ingredients. Her style turns humble vegetables into the kind of dishes people ask for at family gatherings, and a Vidalia onion casserole fits that tradition well. Read more about her in our stories and keep up with the latest on our news page.
Vidalia onions are grown in a designated region of southeast Georgia and are prized for a mild, sweet flavor with little of the sharp bite of regular onions. That makes them ideal as the star of a dish rather than a background seasoning. Here they are boiled briefly, softened in butter, and folded into a rich custard of eggs, evaporated milk, and cheese.
The result is a Southern side dish in the same family as squash and cabbage casseroles: soft, savory, and creamy underneath, with a buttery Ritz cracker crunch on top. It works on a holiday table, at a potluck, or next to a simple Sunday dinner, and it’s a great way to use up a bag of sweet onions. Browse more in our recipe collection.
Watch How It’s Made
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Brenda Gantt Vidalia Onion Casserole Recipe
Ingredients
Casserole
Cracker Topping
Kitchen Tools Needed
- Large pot
- Large skillet
- Large mixing bowl
- 9×13 inch baking dish
- Sharp knife & cutting board
New to the tools? Our kitchen guides cover choosing knives, skillets, and baking dishes.
Instructions
- Slice the onions. Trim the ends, cut each onion in half, and slice into ¼-inch pieces.
- Boil the onions. Put the sliced onions in a pot, cover with water, and boil for 5 minutes. Drain very well.
- Sauté in butter. Melt 3 tablespoons butter in a large skillet over medium heat. Cook the drained onions for 5 to 8 minutes until soft but not browned. Set aside.
- Preheat and prep. Preheat the oven to 350°F (175°C) and grease a 9×13 inch baking dish.
- Mix the filling. In a large bowl, whisk the eggs and evaporated milk. Stir in 1 cup crushed crackers, the cheddar, Parmesan, salt, pepper, and the cooked onions.
- Add the topping. Spread the mixture in the baking dish. Toss 1 cup crushed crackers with 3 tablespoons melted butter and sprinkle evenly over the top.
- Bake and rest. Bake uncovered for 25 to 30 minutes, until set in the center and golden on top. Let rest for 10 minutes before serving.
Want to prep faster? See our cooking tips for slicing onions without tears.
Nutrition Facts
| Calories | 335 |
|---|---|
| Protein | 11 g |
| Carbohydrates | 23 g |
| Fat | 22 g |
| Fiber | 2 g |
| Sodium | 620 mg |
| Sugar | 9 g |
Nutrition values are estimates and are not a substitute for professional dietary advice.
Health Benefits of Onion Casserole
Plant Antioxidants
Onions contain flavonoids such as quercetin, plant compounds studied for their antioxidant activity.
Gut-Friendly Fiber
Onions contain prebiotic fibers that feed beneficial gut bacteria and support digestive health.
Calcium Source
Cheese and evaporated milk provide calcium for bone health.
Protein
Eggs and cheese add protein, which helps the dish keep you full longer.
What to Avoid
Preparation Mistakes
- Don’t skip draining the onions. Extra water thins the custard and makes the casserole soggy.
- Don’t brown the onions. Cook them just until soft to keep the flavor sweet and mild.
- Don’t use sharp yellow onions. Stick with Vidalia or another sweet variety.
- Don’t crush the crackers to dust. Keep them coarse for better crunch.
Storage Mistakes
- Don’t store it while hot. Cool completely to prevent condensation and a soggy topping.
- Don’t freeze it with the topping. Freeze without crackers and add a fresh buttered topping when reheating.
Dietary Considerations
- Contains Dairy (cheese, milk, butter)
- Contains Egg
- Contains Gluten (crackers)
- Moderate Sodium
Pro Tips for the Best Onion Casserole
- Slice evenly. Uniform ¼-inch slices cook at the same rate and hold their shape.
- Boil, then drain well. Pressing the onions gently in a colander removes extra water.
- Use freshly shredded cheese. It melts more smoothly than pre-shredded cheese.
- Add a pinch of cayenne (¼ teaspoon) for a gentle kick if you like heat.
- Let it rest 10 minutes so the custard sets and the casserole scoops cleanly.
Find more techniques in our cooking tips.
What to Serve With Vidalia Onion Casserole
Beverages
- Sweet tea
- Chardonnay
- Lemonade
Main Dishes
- Baked ham
- Roast chicken
- Pork chops
- Grilled steak
When to Serve
- Easter dinner
- Sunday supper
- Potlucks
- Holiday meals
Love onions? Pair it with our French onion soup for a full onion-lover’s meal.
Ingredient Substitutions
| Ingredient | Swap | Notes |
|---|---|---|
| Vidalia onions | Walla Walla, Texas 1015, or Maui onions | Any sweet onion works; avoid sharp yellow onions. |
| Evaporated milk | Half-and-half or whole milk | Slightly lighter custard. |
| Ritz crackers | Club crackers, saltines, or panko | Add a little extra butter to the topping. |
| Parmesan | Extra cheddar or Gruyère | Gruyère adds a nutty depth. |
| Sharp cheddar | Swiss or Colby Jack | Swiss gives a classic onion-casserole flavor. |
Storage & Reheating
Refrigerator
Cool completely, then store in an airtight container for 3 to 4 days.
Freezer
Freeze the baked casserole without the topping for up to 2 months. Thaw overnight in the fridge.
Reheating
Oven at 350°F for about 20 minutes, adding fresh buttered cracker crumbs. Microwave individual servings.
Make ahead: mix the filling, cover, and refrigerate up to 24 hours. Add the topping just before baking.
Frequently Asked Questions
No. Any sweet onion works, such as Walla Walla, Texas 1015, or Maui onions. Avoid regular yellow or white onions, which are sharper and can make the casserole taste harsh.
A short boil softens the onions and mellows their flavor, and draining them well keeps the filling from turning watery. Sauteing them in butter afterward adds richness without browning them.
Yes. Mix the filling, cover, and refrigerate for up to 24 hours. Keep the cracker topping separate and add it just before baking so it stays crisp. Add a few extra minutes to the bake time if the dish goes in cold.
It can be frozen, but the texture is best fresh. If you freeze it, bake it first, cool completely, and freeze without the cracker topping for up to 2 months. Thaw overnight in the refrigerator and add a fresh buttered topping before reheating.
Club crackers, saltines, or panko breadcrumbs all work. Saltines and panko are less buttery, so add a little extra melted butter to the topping.
Yes. Because the filling is an egg-and-cheese custard, it works well next to eggs, bacon, or ham at brunch. See our breakfast recipes for more ideas.
Reader Reviews
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