Impossible Ham and Swiss Pie


 


This recipe uses the classic combination of ingredients that make this dish so reliably delicious.

For the Filling

IngredientAmountNotes
Diced cooked ham1½ to 2 cupsLeftover holiday ham or good-quality deli ham works beautifully 
Shredded Swiss cheese1 cupShred it yourself for the smoothest melt 
Chopped onion⅓ to ½ cupYellow or green onion for a gentle, savory bite 

For the Batter

IngredientAmountNotes
Large eggs4The binding that creates the custard filling 
Whole milk2 cupsWhole milk gives the richest texture 
Biscuit baking mix1 cupThis is what creates the "impossible" crust 
Salt and pepperTo taste
Garlic powder, onion powder½ teaspoon each (optional)Adds extra savory depth 

A Note on Ingredients: The classic version uses a biscuit mix like Bisquick to create the self-forming crust . If you don't have any on hand, a flour-based version is also an option .

Step-by-Step Instructions

1. Preheat and Prepare

Preheat your oven to 400°F (200°C) . Lightly grease a 9-inch or 10-inch pie plate with butter or cooking spray .

2. Layer the Filling

Spread the diced ham evenly across the bottom of the prepared pie dish. Sprinkle the shredded Swiss cheese and chopped onion over the ham .

3. Make the Batter

In a separate bowl, whisk together the eggs, milk, biscuit mix, and seasonings until mostly smooth. A few tiny lumps are perfectly fine—just don't overmix .

4. Pour and Bake

Pour the batter slowly over the ham and cheese mixture. Do not stir—this is where the "impossible" magic happens . Bake for 35 to 40 minutes, until the top is puffed and golden brown and a knife inserted in the center comes out clean .

5. Rest and Serve

Let the pie cool for 5 to 10 minutes before slicing. This allows the custard to set, so your wedges hold their shape beautifully .

Pro Tips for the Best Impossible Pie

  • Shred your own cheese. Pre-shredded cheese contains anti-caking agents that can affect how smoothly it melts into the filling .

  • Pat ham dry if it's wet. Excess moisture can make the filling loose, especially with deli ham.

  • Don't overmix the batter. Whisk just until the dry mix is moistened. Overmixing can make the pie tougher around the edges .

  • Layer in the right order. Ham, cheese, and onion go in the dish first, then the batter is poured over the top. This allows the layers to form properly .

Delicious Variations to Try

VariationWhat to Add/Change
Cheese SwapUse sharp cheddar, Gruyère, or a blend of your favorites 
Meat SwapReplace ham with crumbled cooked bacon or sausage 
Add VegetablesStir in wilted spinach, sautéed mushrooms, or steamed broccoli 
Asparagus & HamLayer fresh asparagus spears with the ham for a spring twist 

Frequently Asked Questions

Can I make this ahead of time?

Yes! You can assemble the pie (unbaked) up to 24 hours in advance and refrigerate. You may need to add 5-10 minutes to the baking time.

How should I store leftovers?

Store leftover pie in an airtight container in the refrigerator for up to 4 days. Reheat gently in the oven or microwave.

What should I serve with this?

For brunch, serve with fresh fruit salad or crispy hash browns. For dinner, pair with a simple green salad or roasted vegetables .

Can I freeze this pie?

Freezing is not recommended, as the texture of the custard can change upon thawing.

A Gentle Reminder

The "impossible" name isn't just clever marketing—it truly captures the delight of watching a simple batter transform into a layered, crusted pie right before your eyes. Whether you serve it for a cozy brunch, a quick dinner, or as a way to use up leftover holiday ham, this recipe is a beautiful reminder that the simplest dishes often bring the greatest comfort.