A commercial muffin mix described as a "rich formula" typically contains:

A commercial muffin mix that is described as a "rich formula" typically emphasizes the inclusion of ingredients that enhance texture, flavor, and overall appeal of the final product. In this context, a "rich formula" would generally indicate the presence of higher proportions of fat and sugar to create a moist and flavorful muffin.

Specifically, high proportions of sugar contribute to sweetness, moisture retention, and browning during baking, while shortening (or any form of fat) provides a tender crumb and enhances the mouthfeel. The combination of these ingredients is crucial for achieving the desired richness and indulgence associated with such muffin mixes.

While the other options may feature interesting ingredients or formulations, they do not specifically align with the idea of a "rich formula." High-fructose corn syrup is commonly used in many baked goods, but its presence does not necessarily signify that a mix is rich. Similarly, whey can enhance texture, but it doesn't directly relate to the richness associated with higher fat and sugar content. Finally, while chemical leavening can affect the rise and texture of baked goods, it does not define the product as "rich," which is primarily concerned with flavor and mouthfeel rather than just leavening capacity.