Egg and Flour Recipe: Crispy Wonton Cups With Perfectly Runny Yolk

This egg and flour recipe delivers the perfect balance of crispy golden edges and a runny, custardy yolk that makes every bite irresistible. 🔥 The secret lies in a delicate batter that transforms into delicate, cup-like shells—ideal for breakfast or a sophisticated appetizer. I developed this technique after years of perfecting tempura and wonton wrappers, combining their crispiness with the comfort of a runny yolk center. The magic happens in the batter: a simple mix of eggs, flour, and water that creates a light, airy texture. When fried to golden perfection, the exterior becomes crisp and shatteringly thin, while the inside remains tender and rich. This method works for both sweet and savory fillings, making it incredibly versatile for any meal. What you'll end up with is a dish that's both elegant and comforting—crispy enough to stand up to dipping sauces, yet tender enough to melt in your mouth. The runny yolk adds a luxurious touch that feels like a little indulgence, perfect for brunch or a special occasion. Once you master the technique, you can fill these cups with anything from spicy tuna to creamy scrambled eggs. Let's get started!

Ingredients for egg and flour

Four simple ingredients create delicate crispy shells with perfect runny yolks inside.

The eggs and flour ratio is everything here—too much flour makes them tough, too little and they won't hold shape. Use cake flour if you've got it—it's lighter than all-purpose and gives that signature wonton texture. For the oil, vegetable or canola works best (high smoke point, neutral flavor), but peanut oil from Trader Joe's is my secret weapon for extra crispiness. Keep your eggs at room temperature—cold eggs won't emulsify properly and can make the batter lumpy. Pro tip: if your batter gets too thick, add ice water 1 tsp at a time until it reaches pudding consistency. Too thin? Add a splash more flour.

No spicy tuna? Scrambled eggs with cheddar or shrimp tempura work perfectly—just keep portions small so they don't make the cups soggy. For the filling, pre-cook anything with liquid (like tuna or shrimp) and drain well to avoid greasy results. The sesame seeds? Toast them in a dry pan for 30 seconds—they'll smell amazing and add that extra crunch. No sesame seeds? Crushed potato chips are a sneaky substitute that actually works. And if you're feeling fancy, try a sweet version with Nutella and strawberries inside—trust me on this one.

These keep for 2 days in the fridge, but honestly they're best eaten fresh when the edges are still crisp. Reheat in a 350°F oven for 5-7 minutes to restore that golden crunch. For freezing, assemble the cups without fillings, freeze solid, then add filling when ready to eat—this keeps everything perfect. I always make a double batch because they disappear fast. Store empty shells in an airtight container with parchment paper between layers so they don't stick together.

Step-by-step instructions for crispy wonton cups with perfectly runny yolk

Here's how to make these addictive little pockets with a golden crust and molten centers.

In a medium bowl, whisk together the 4 whole Large Eggs until the yolks and whites are fully combined and the mixture is uniform. Add the 1 cup All-Purpose Flour and the 0.5 tsp Diamond Crystal Kosher Salt, then whisk vigorously for about 1 minute until smooth and free of lumps. This creates the foundation for our crispy shells.

Next, gradually add the 0.5 cup Ice Water, whisking constantly as you go. The batter should be thin but cohesive—like heavy cream. If it's too thick, add 1 tablespoon more ice water; if too thin, whisk in 1 tablespoon more flour. The perfect consistency lets the batter spread easily but still hold its shape when fried. Here's the thing—this batter needs to be cold, so if your kitchen is warm, chill the bowl in the fridge for 10 minutes before proceeding.

Heat the 2 cups Vegetable Oil in a deep skillet or wok over medium-high heat until it reaches 350°F—test with a wooden chopstick: bubbles should form around it immediately. Working in batches (don't overcrowd!), carefully ladle 2-tablespoon portions of batter into the hot oil, using a spoon to shape them into half-moon cups.

Fry for 2-3 minutes per batch until the edges turn deep golden brown and the shells puff slightly at the edges. They're ready when they float to the surface and hold their shape. Use a slotted spoon to transfer them to a paper towel-lined plate to drain. Pro tip: If the oil smokes too much, lower the heat slightly—we want crispy, not burnt. Here's where patience pays off: don't rush this step, or your cups won't be perfectly crisp.

Let the fried wonton cups cool for 2 minutes, then carefully cut each one in half with kitchen shears to create little cups. Spoon 1 tablespoon of Spicy Tuna Filling into each half, pressing gently to create a neat mound. The filling should peek out slightly at the top—that's how you know it's packed just right.

Gently press the two halves back together to reform the cups. Here's the moment that matters: use a toothpick to secure them if needed, but don't over-pack the filling or they'll burst when you bite in. If you're feeling fancy, add a pinch of toasted Sesame Seeds on top for extra crunch and aroma. The contrast between the crispy shell and gooey filling is what makes these irresistible.

Serve the wonton cups immediately while still warm—this ensures that crispy shell stays perfect. For the ultimate experience, prepare the Sriracha Sauce by thinning it slightly with 1 tablespoon of water if needed, then drizzle it over the top or serve it on the side for dipping. The heat from the sauce will make the runny yolk inside melt even more deliciously.

Garnish with the 0.25 cup Fresh Cilantro, chopped finely for a pop of color and freshness. These crispy cups are best enjoyed right away, but if you must store them, keep them in an airtight container for up to 2 hours—just know they won't be quite as crisp. Real talk: the first bite is always the best, so don't wait too long to dig in!

Make-ahead tips for this dish

Prep Ahead Shells

Make the batter and fry the wonton cups 1 day ahead—they keep beautifully in an airtight container at room temperature. Store the empty shells separately from any fillings to maintain crispness. I always prep a batch on Sunday for brunch the next day—just reheat for 30 seconds in a 350°F oven before filling. The key is to let them cool completely before storing to prevent condensation. 💫

Filling Flexibility

Pre-cook and chill all fillings 24 hours ahead to streamline assembly. For the spicy tuna, mix it with 1 tbsp soy sauce and 1 tsp sesame oil—this keeps it stable for storage. I also prep a simple scrambled egg filling with sharp cheddar and green onions that reheats perfectly. Keep fillings in small ramekins for easy portioning later.

Freezer-Friendly Cups

Assemble the cups without fillings, then freeze on a parchment-lined tray for 1 hour before transferring to a ziplock bag. When ready to serve, thaw for 15 minutes at room temperature, then fill and fry in 375°F oil for 1 minute to restore crispness. This is my go-to for last-minute parties—just pull from the freezer and go! 🥶

Make-Ahead Dipping Sauces

Prepare the Sriracha dip up to 3 days ahead by thinning it with water or lime juice and storing in a sealed jar. For extra flavor, add 1 tsp honey and ½ tsp grated ginger. I also make a creamy avocado lime sauce that keeps for 2 days refrigerated—just blend 1 avocado, 2 tbsp lime juice, ¼ cup sour cream, and salt to taste. 🍋

Batch Cooking Tips

Double the batter recipe but fry in small batches to avoid overcrowding—this ensures even cooking. I use a wire cooling rack to drain fried cups, which prevents sogginess. For large gatherings, prep 3-4 batches of empty shells, then fill and serve family-style. The shells reheat beautifully in a 200°F oven for 5 minutes if needed, but they're best fresh from the fryer. 🍴

Frequently asked questions