Coffee Flan
Whisk 4 teaspoons of instant espresso powder into the egg-milk mixture until dissolved.
Orange-Cardamom Flan
Whisk 2 tablespoons orange zest and ΒΌ teaspoon ground cardamom into the egg-milk mixture before straining.
Almond Flan
Reduce vanilla to 1 tablespoon and whisk 1 teaspoon almond extract into the egg-milk mixture.