Preheat oven to 350°F. Grease and line two 8-inch cake pans with parchment paper. Whisk wet ingredients in a large bowl, ensuring coconut milk is smooth. Whisk in dry ingredients until smooth batter forms.
Transfer to pans evenly and let sit for 5 minutes. Bake for 28-35 minutes until toothpick comes out clean. Let cool in pans for 10-15 minutes, then flip onto wire rack.
Cream butter for frosting for 2-3 minutes, then beat in powdered sugar, milk, vanilla, and salt. Add frosting between cake layers, optional jam, and finish with more frosting. Top with berries if desired.
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