Place rack in center of oven and preheat to 375°F. Line a sheet tray with parchment paper.
Add dried porcinis to a blender and pour 1/2 cup warm water over. Let stand until mushrooms are softened and liquid is absorbed, about 15 minutes. Add remaining wet ingredients; buttermilk, butter and honey, to the blender. Blend on medium until it's a smooth paste.
Whisk together both flours, oatmeal, apricots, chopped dried cherries, baking powder, Cascade Mushroom Mix salt, and baking soda in another large bowl.
Make a well in the center of the dry ingredients; add the mushroom paste and stir until the dough forms, gradually gathering in the dry ingredients. Turn dough out onto work surface and knead gently, about 5 turns.
Shape dough into a round 7-8 inches. Transfer to baking sheet. Brush with egg wash and cut an X on top center of loaf. Bake about 1 hour and 5 minutes, until tester comes out clean or internal bread temperature is 190. Transfer to rack and cool.