Grand Marnier Souffl?

Step 1
Preheat the oven to 400 degrees F (200 degrees C). Brush the insides of two (8-ounce) ramekins with 1 tablespoon melted butter; sprinkle with 1 tablespoon sugar. Place on a baking sheet lined with aluminum foil.

Step 2
Melt 5 teaspoons butter in a saucepan over medium-low heat; cook and stir flour in hot butter until golden brown and fragrant, about 2 minutes. Pour in milk and cook, stirring continuously, until smooth and thick, 3 to 4 minutes. Pour into a large bowl. Stir in orange liqueur and zest. Add egg yolks and vanilla; mix until smooth.

Step 3
Whisk egg whites in a second large bowl until frothy. Slowly add 2 tablespoons sugar and whisk until combined. Add remaining 2 tablespoons sugar and continue to whisk until meringue holds its shape and is thick but not stiff.

Step 4
Fold 1/2 of the meringue into egg yolk mixture until combined. Gently fold in remaining meringue until well mixed. Transfer to the prepared ramekins, leaving 1/4-inch space at the top.

Step 5
Bake in the preheated oven until risen and browned, about 16 minutes.