Preheat oven to 335°F. Grease and line three 8-inch round cake pans with parchment.
Whisk soy milk and apple cider vinegar. Let sit 10 minutes to curdle.
In a large bowl, whisk dry ingredients
In a separate bowl, whisk wet ingredients.
Pour wet ingredients into dry and whisk gently. Do not overmix.
Divide batter evenly between pans.
Bake 20-22 min.
Cool in pans for 10 minutes, then transfer to racks to cool completely.
Beat butter on medium-high speed for 5 minutes until smooth and slightly lightened but still dense.
Add freeze-dried strawberry powder, vanilla, and salt. Beat until fully incorporated and evenly colored.
Add powdered sugar and mix for at least 5 min.
Add non-dairy heavy cream 1 tablespoon at a time until desired consistency.
Mix on low for 1-2 minutes
Place first layer on cake board and spread an even layer of buttercream.
Repeat with remaining layers & wrap cake with remaining buttercream
