Add almond milk, oat milk, maple syrup, and vanilla extract into a saucepan.
Heat gently over medium heat until warm.
Froth the mixture until light and creamy.
Brew espresso using your preferred method.
Pour milk mixture into a glass, filling halfway.
Add espresso slowly over the milk to create layers.
Stir gently if you prefer blended flavor.
Add ice before milk for a chilled version.
Serve immediately and enjoy smooth texture.