Ingredients
Equipment
Method
Preheat oven and baking dish
- Place an oven rack in the center. Put your empty 9×13-inch baking dish in the oven and preheat to 425°F (218°C). Let the dish heat for at least 10–15 minutes after the oven reaches temperature.
Mix dry ingredients
- In a large bowl, whisk together flour, salt, and sugar.
Prevent lumps with a “paste first” method
- Pour in about 2 cups (475 ml) of the milk and whisk until you get a smooth, thick paste—no dry flour hiding in corners.
Add eggs, then the rest of the milk.
- Whisk in the eggs one at a time, mixing well after each. Add remaining milk and vanilla. The batter will be thin—more like heavy cream than “pancake batter.”

Butter + sizzle
- Carefully remove the hot baking dish from the oven. Add the butter cubes and swirl until melted and bubbling (a little nutty browning is welcome).

Pour and bake—no oven peeking.
- Pour batter into the hot, buttered dish and return to oven immediately. Bake 30–35 minutes, do not open the oven door for the first 25 minutes.

Rest (it will deflate a bit—good!)
- Remove from oven when deeply golden at the edges and puffed. Rest 5–10 minutes. Slice into squares.

Notes
- Room-temp ingredients = better rise.
- Preheated pan is non-negotiable for that dramatic puff.
- A slight collapse after baking is normal and helps create a jam-catching “crater.”
