Preheat the oven: Set to 350°F (175°C). Grease and line two 8-inch round cake pans.
Mix dry ingredients: In a medium bowl, combine flour, baking powder, and salt. Set aside.
Cream butter and sugar: In a large bowl, beat butter and sugar together until light and fluffy.
Add eggs: Mix in eggs one at a time, beating well after each addition.
Add wet ingredients: Stir in mango purée, vanilla extract, and milk.
Combine: Gradually add the dry ingredients, mixing just until smooth. Do not overmix.
Bake: Divide the batter evenly between the pans. Bake for 25–30 minutes, or until a toothpick inserted in the center comes out clean.
Cool: Let cakes cool in pans for 10 minutes, then transfer to a wire rack to cool completely.
Prepare frosting: In a chilled bowl, whip heavy cream and powdered sugar until soft peaks form. Add mango purée and lemon juice; whip until creamy.
Assemble: Spread frosting between the cake layers and over the top and sides.
Decorate: Use fresh mango slices, glaze, or fruit decorations for a tropical look.
Chill and serve: Refrigerate for 30 minutes before serving for best flavor and texture.