Preheat the Oven:
Preheat your oven to 350°F and grease the 9-inch round cake pan with butter or oil.
Prepare Dry Ingredients:
In a bowl, mix together the flour, baking powder, baking soda, and salt.
Cream Butter and Sugar:
In another bowl, beat the softened butter and sugar until light and fluffy. Add the eggs, one at a time, and beat well.
Add Coffee and Dry Ingredients:
Slowly add the cold brew coffee and dry ingredients, alternating between the two. Mix until smooth. Stir in vanilla extract.
Add Toasted Coconut:
Gently fold in the toasted coconut.
Bake:
Pour the batter into the prepared cake pan and bake for 35-40 minutes, or until a toothpick comes out clean. Let it cool.
Make the Frosting:
Beat together softened butter, powdered sugar, cold brew coffee, vanilla extract, and salt until smooth and creamy.
Assemble:
Spread the frosting on the cooled cake. Garnish with toasted coconut.