Combine all of the Streusel ingredients except the apples and pecans.

Mix until the butter is evenly blended in. Mix in the apples and pecans later.

Keep chilled until ready to use.

Preheat oven to 325. Butter and flour a 12 cup bundt pan, or use Baker's Joy.

Cream the butter and sugar together. Add the egg, yogurt, applesauce and vanilla. Mix well and set aside.

Sift together dry ingredients: flour, baking powder, baking soda, cinnamon, mace, and salt. Slowly add this to the liquid ingredients, beating on low. When all ingredients are together, beat on medium for about 2 minutes.

Pour half of the batter into the bundt pan, spreading evenly. Spoon the apple streusel filling in the middle of the batter, making sure none reaches either edge. Very gently, press into the batter. Top with remaining batter. Carefully spread so no streusel is showing. Bake for 80-90 minute or until a toothpick comes out clean.

Let cool for 10 minutes then flip onto a serving platter, and very carefully remove bundt pan.