Optional: a few ice cubes to make a colder smoothie
Optional mix-ins(see notes)
Place all ingredients in a blender and blend until smooth.
If you have access to them, I recommend using frozen avocado chunks in this smoothie (you can find them in the freezer section of a lot of grocery stores and big box stores now, or you can make your own). They'll make your smoothie cold and even thicker than fresh avocado. That said, if your blender is a bit iffy, use fresh avocado to avoid any blending issues.
This smoothie can be made up to 12 hours ahead of time and chilled in the fridge.
This simple base recipe can be modified to your preferences with spices and extracts. A few ideas:
"Cinnamon Toast Crunch": An extra tablespoon of Swerve Confectioners + 1/4 tsp cinnamon