Place raspberries in a bowl. Use a spoon to mash them.
Place a fine mesh strainer over another bowl and pour the mashed raspberries into the strainer. Gently press with a spoon. Use the pulp in your next smoothie. You should have ¼ cup of raspberry mix.
Beat the vegan butter with a mixer on medium speed until creamy, around 2 minutes.
With the mixer on low, add powdered sugar, one cup at a time.
Add vanilla and beat until combined. Beat in one tablespoon at a time of the raspberry mixture. Then turn the speed to high and whip until smooth and creamy.
Assess the consistency. If it's too soft, mix in a bit more powdered sugar. If it's too stiff, mix in a teaspoon of creamer.
Store frosting in an airtight container in the fridge for up to 2 weeks. When you're ready to use it, allow it to come to room temperature and maybe even add another teaspoon or two of plant-based milk until the spreadable consistency returns.
Notes
This recipe will make enough frosting for up to 16 cupcakes (depending on how much frosting you add to each cupcake). It will frost a 9x12 quarter sheetcake.
Vegan Creamer Options
Vegan Creamer (Silk, etc.)
Vegan Half & Half (Ripple)
Coconut Milk (shake the can first)
You can substitute a creamy plant-based milk like cashew milk, soy milk, etc.