Chocolate Rye Crumb Cake

Ingredients

• 1/3 cup sugar
• ¼ cup all-purpose flour
• ¼ cup rye flour
• 3 tablespoons cacao nibs
• 2 tablespoons cocoa powder
• ¼ teaspoon Kosher salt
• ¼ cup chilled butter, cut into pieces
• ¾ cup all-purpose flour
• ¾ cup rye flour
• ½ cup cocoa powder
• 1 teaspoon baking powder
• ¾ teaspoon baking soda
• ¾ teaspoon Kosher salt
• ¾ cup butter, room temperature
• ½ cup sugar
• 1/3 cup packed brown sugar
• 2 large eggs
• 1 teaspoon Vanilla
• ¾ cup buttermilk
• ¼ cup plain whole milk Greek yogurt