Measure the ingredients: 1 cup of strawberries, ½ cup of rolled oats, and 1 cup of milk.
If using fresh strawberries, wash and hull them. If using frozen, measure as is.
Combine the strawberries, rolled oats, milk, honey or maple syrup, vanilla extract, and the optional banana in the blender.
Blend on high until smooth and creamy, about 1-2 minutes. For a thicker smoothie, add a few ice cubes and blend again.
Taste the smoothie; adjust sweetness if necessary by adding more honey or maple syrup.
Pour the smoothie evenly into glasses and serve immediately.
For storage, if needed, this smoothie can be kept in the fridge for up to 24 hours, but it's best enjoyed fresh.