Yes, maple syrup or honey can be used as substitutes for vanilla extract, but they alter the flavor and moisture balance. Follow these guidelines:
1. Substitution ratio: Use a 1:1 ratio for small amounts, though neither will provide a true vanilla flavor.
2. Maple syrup provides a woody, caramel note that works well in oatmeal, pancakes, and baked goods.
3. Honey provides a floral sweetness but has a distinct taste that will dominate mild recipes.
4. Adjust other liquid ingredients downward slightly to compensate for the added moisture from the syrup or honey. Expect a sweeter final product.