3/4 cup sour cream
1 cup freshly grated Parmesan
1/4 cup grated Gruyère cheese
When ready to bake, preheat oven to 400 degrees. Brush each pastry with remaining egg yolk. Bake until pastry is golden brown and puffed, about 25 minutes. Transfer to a wire rack; let puffs cool in pan for 10 minutes.
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Disclaimer: I have an ongoing relationship with STAR Fine Foods for my recipes and photography using their wonderful products. This post is sponsored by STAR. I am compensated for my time and work and I am sent products as I request them. However, all opinions of the product stated in this post are 100% my own. I truly love their products!