Milk Substitutes for Baking: What Works, What Doesn't, and How to Convert Any Recipe

Milk does several distinct things in baking: it hydrates dry ingredients, contributes fat and protein to structure and browning, adds lactose (which caramelises during baking), provides a medium for activating leavening agents, and tenderises gluten through its fat content. Any substitute that replaces milk in a recipe needs to address some or all of these functions, and no single substitute performs identically to cow's milk in every context. The best milk substitute for any recipe depends on what role the milk is playing in that specific recipe, not on which plant milk is most popular.

What Milk Does in Baking: Understanding the Functions

• Hydration: Milk is approximately 87% water; it provides the liquid needed to hydrate flour proteins (forming gluten) and activate leavening agents. Any liquid can substitute for milk's hydration function.
• Fat: Whole milk contains approximately 3.5% fat; semi-skimmed 1.5% to 1.8%; skimmed under 0.5%. Fat tenderises gluten, contributes richness, and helps create a moist crumb.
• Protein: Milk contains 3.2% to 3.4% protein (primarily casein and whey), which contributes to browning (Maillard reaction with sugars at high heat), structure in custards and egg-enriched recipes, and emulsification.
• Lactose: The natural sugar in milk (4.7% of whole milk) caramelises at baking temperatures, contributing to golden crust colour and a slightly sweet background flavour.
• Acidity: Milk has a pH of approximately 6.7 (slightly acidic). In recipes with bicarbonate of soda (baking soda) as a leavening agent, the milk's acidity activates the soda; substitutes need comparable acidity to maintain this function.

The Best Milk Substitutes by Category

Soy Milk: The Most Reliable All-Purpose Substitute

Soy milk most closely approximates cow's milk in both protein content (3 to 4g per 100ml, comparable to whole milk's 3.4g) and overall composition. The protein content means soy milk behaves most like dairy milk in protein-dependent recipes: custards, quiches, enriched breads (brioche, challah), and soufflés. Substitute 1:1 for whole milk in any recipe. Use unsweetened, unflavoured soy milk for savoury applications; the slight beany background flavour is imperceptible in most baked goods once mixed with other ingredients. Soy milk curdles when added to hot acidic liquids; this is useful when making vegan buttermilk (add 1 tablespoon white vinegar or lemon juice to 240ml soy milk, stir, and allow to curdle for 5 minutes).

Oat Milk: Best for Everyday Baking

Oat milk is the plant milk that has overtaken others in popularity since 2019, and its functional baking properties support its position. A higher natural sugar content than most plant milks (approximately 3 to 5g per 100ml from oat starch breakdown) contributes to browning that more closely resembles dairy milk than almond or rice milk. The creamy, neutral flavour integrates well with both sweet and savoury baked goods. Protein content (1 to 1.5g per 100ml) is lower than soy milk or cow's milk, which limits its suitability for protein-sensitive applications. Substitute 1:1. Barista-edition oat milks (Oatly Barista, Minor Figures) contain added oil and stabilisers that improve their texture in hot beverages but have no significant advantage over standard oat milk in baking.

Almond Milk: Best for Light, Delicate Recipes

Almond milk contains very little protein (under 1g per 100ml) and very little fat in commercial products (1 to 2g per 100ml), making it the least functionally similar to cow's milk. The result in baking is a lighter, slightly drier texture than dairy milk, and less browning on the crust. In recipes where milk is primarily providing hydration (thin pancakes, simple muffins, quick breads where eggs provide most of the structure), almond milk works acceptably. In protein-critical recipes (custard, Yorkshire pudding, enriched dough), the low protein content produces noticeably different and inferior results compared to dairy milk or soy milk. The mild, slightly nutty flavour complements cakes and cookies; it can taste thin in savoury applications. Substitute 1:1, but expect slightly lighter colour and texture.

Full-Fat Coconut Milk: Best for Rich Recipes

Full-fat coconut milk (from a tin, not the refrigerated carton beverage) contains 17 to 24% fat, significantly richer than whole cow's milk. In recipes requiring cream or rich dairy, tinned coconut milk is the best vegan substitute and often produces excellent results: coconut cream can be whipped to soft peaks when well-chilled (use only the solid cream from the top of the tin), and full-fat coconut milk enriches curries, rice puddings, cakes, and ganaches. The coconut flavour is noticeable and desirable in some recipes; use a mild, deodorised coconut milk when the flavour would be unwanted. Substitute 1:1 for whole milk but expect a richer result; substitute for cream in recipes where richness is the primary requirement.

Water: When It Works and When It Doesn't

Water can substitute for milk in recipes where milk is providing only hydration and where the fat, protein, and sugar in milk are not central to the result. Thin-batter pancakes, simple bread doughs (lean breads without enrichment), and biscuit-like recipes work reasonably well with water. The crust will be paler (no lactose for Maillard browning), the crumb may be slightly less tender (no fat), and the flavour will be plainer. For a closer substitution, add 1 tablespoon of butter or neutral oil per 240ml of water to approximate milk's fat content.

Vegan Buttermilk

Buttermilk in baking is valued for its acidity, which activates bicarbonate of soda and tenderises gluten. Any plant milk can be made into a functional buttermilk substitute by adding acid: 1 tablespoon of white wine vinegar, apple cider vinegar, or lemon juice per 240ml of plant milk. Stir, allow to curdle for 3 to 5 minutes, and use immediately. Soy milk produces the most convincing curdled texture; other plant milks may not curdle visibly but the acidification still provides the functional acidity the recipe requires.

Quick Conversion Reference

Related: Plant-Based Milk Complete Comparison: Which Is Best? | How to Make Oat Milk at Home