Preheat oven to 350°F (175°C). Grease two 6-inch cake pans and line with parchment paper.
Mix milk + vinegar in a bowl; set aside to curdle (vegan buttermilk).
Whisk flour, baking powder, baking soda, and salt in a bowl.
In another bowl, mix applesauce, maple syrup, oil, and vanilla. Add the curdled milk.
Gradually fold wet ingredients into dry until just combined (don’t overmix).
Divide batter evenly into pans. Bake for 18-22 mins until a toothpick comes out clean.
Cool in pans for 5 mins, then transfer to a rack.
Beat cream cheese, yogurt, honey, and vanilla until smooth. Chill for 10 mins.
Frost cooled cake layers and decorate with fruit or sprinkles.