margarine or butter softened

Softened butter or margarine refers to these fats brought to a pliable, spreadable consistency at room temperature, typically between 65–72°F (18–22°C). Butter is a dairy emulsion made by churning cream, consisting primarily of butterfat with water and milk solids, while margarine is a plant-based or partially hydrogenated oil emulsion developed as a butter substitute in the late 19th century. When softened, both products transition from their solid state into a creamy texture that retains enough structure to hold air when creamed with sugar, making them essential for baking applications like cakes, cookies, and pastries.

The softening process is critical in pastry work: properly softened fats incorporate air more efficiently during creaming, creating light, tender crumb structures. Butter contains approximately 80–82% butterfat and 16–18% water; margarine formulations vary but typically contain 80% fat with added water, emulsifiers (lecithin), and often vegetable oils like soybean or canola oil.

Softened butter and margarine are foundational in baking, where they are creamed together with sugar to incorporate air and create tender baked goods. This technique is essential for cakes, cookies, quick breads, brownies, and many pastries. Beyond baking, softened butter serves as a finishing fat for sauces, a base for compound butters, and a spreading agent for sandwiches and toast. In savory cooking, softened butter is whisked into sauces (beurre blanc) for emulsification and richness. Margarine is often preferred in commercial baking for consistency and shelf stability, though butter is favored for superior flavor in artisanal applications. The choice between butter and margarine affects both texture and taste; butter produces richer flavor and flakier pastries, while margarine may yield more uniform results in high-volume production.