The present invention relates to a method of producing a protein containing dairy mousse, such as a quark mousse or a yogurt mousse. In particular, the present invention relates to a method of producing whipped dairy products involving the use of an ideal whey protein solution and protein modifying enzyme in the production of dairy mousses. The invention enables the production of dairy whipped products with relatively high protein content simultaneously with relatively low carbohydrate and fat contents in which the bubbles improve the mouth feel and rheological performance of the product.