I have not made this recipe, but it sounds like what you are looking for.
Dark Chocolate Macaroon Bundt Cake
Filling
2 egg whites
½ cup white sugar
2 cups flaked coconut, ground into small pieces
2 tablespoons of all purpose flour
2 teasoons of vanilla extract
Cake...
1 (18.25-ounce) box chocolate cake mix
1 (4-serving size) package chocolate instant pudding
2 egg yolks
2 eggs
1 1/4 cups water
1/3 cup vegetable oil
vanilla glaze (below)
Vanilla Glaze
1 1/2 cups powdered sugar
2 1/2 teaspoons of milk
1/8 teaspoon of salt
¼ teaspoon vanilla
1 teaspoon of butter
Preheat oven to 350 degrees, grease and flour bundt cake pan.
1. Beat egg whites until peaks form. Gradually beat in sugar until stiff peaks form. Fold in coconut, flour and vanilla. Set aside.
2. Combine cake mix, instant pudding mix, 2 yolks, 2 eggs, water, and oil in a large bowl. Beat with electric mixer on medium speed for 2 minutes. Pour 1/3 of the batter into prepared pan. Spoon in coconut mixture and top with remaining batter.
3. Bake for 50 to 55 minutes. Remove to wire rack, and cool 15 minutes before removing from pan. Cool thoroughly, and top with glaze.
4. Melt butter. Mix all ingredients together, top cake.