- ½ cup milk
- 8 tbsp. unsalted butter, cubed
- ½ tsp. kosher salt
- 1 cup flour
- 4 eggs, at room temperature
- 6 oz. Gruyère cheese, grated
Heat oven to 425°.
Bring milk, butter, salt, and ½ cup water to a boil in a 4-qt. saucepan over high heat. Add flour; stir until dough forms. Reduce heat to medium; cook, stirring dough constantly with a wooden spoon, until slightly dried, about 2 minutes.
Transfer to a bowl; using a hand mixer, beat in 1 egg until smooth. Repeat with remaining eggs, beating each one at a time, until dough is smooth; stir in cheese.
Using a small scoop or tablespoon, drop balls of dough onto parchment paper-lined baking sheets.
Place in oven; reduce temperature to 375°.
Bake until golden brown, about 30 minutes.