Combine all ingredients in a blender and blend. Add water or ice cubes to reach desired consistency.
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Notes
If you are vegan, you will want to substitute collagen protein equally with your preferred type of vegan protein powder. Rice protein or a flavorless vegan blend of different proteins will probably do the best to not change the flavor of the pumpkin smoothie. Although I like proteins like pea protein or hemp, they will change the flavor of the smoothie, so you may have to make adjustments if you use those.
If you are on AIP, you will want to omit the pumpkin pie spice and use equal parts cinnamon instead. You'll also need to substitute coconut milk for almond milk and switch out coconut butter for the nut butter.
Maple syrup goes perfectly with the pumpkin pie flavor, but you can substitute it equally with a sweetener of your choice like honey, coconut sugar, monk fruit sweetener or swerve. If you prefer a sweeter smoothie, add more of your preferred sweetener 1 tablespoon at a time until it reaches your desired sweetness level.
Another delicious substitution I've made with this recipe is switching out the pureed pumpkin with cooked sweet potato. Since sweet potato tends to be a bit thicker it just requires a bit more almond milk. It makes for a delicious smoothie!
You can always add more milk, water or ice cubes to create your desired consistency.
The nutrition facts below are for one smoothie made with the standard ingredients including unsweetened almond milk, collagen protein, maple syrup and cashew butter. If you make any substitutions it will change the nutritional make up.