Baking Ingredients Guide: Flour, Fat, Sugar, Eggs and Leavening
How common baking ingredients influence structure, tenderness, flavor and rise.

Flour builds structure
Protein content influences gluten development and texture.
Fat tenderizes
Butter and other fats affect flavor, texture and dough handling.
Sugar does more than sweeten
Sugar also influences browning, moisture and tenderness.
Eggs contribute structure and richness
Their proteins, fat and water all affect the final bake.
Leavening needs balance
Too much chemical leavening can create poor flavor and unstable structure.