Preheat oven to 400 degrees F. Line muffin pan with muffin liners.
Make the streusel. In a medium bowl, combine oats, flour, cinnamon, sugar, and butter until well combined. Chill in the fridge while you make the muffin batter.
Whip together softened butter with honey and vanilla. Set aside.
Combine dry ingredients for chai pear muffins including all-purpose flour, whole wheat flour, baking powder, sugar, cinnamon, ground ginger, allspice, cloves, cardamom, and salt in a large bowl. Whisk together milk with vegetable oil, egg, and vanilla. Add to the dry ingredients and mix until well combined. Stir in chopped pear.
Fill muffin pan ¾ full and top with streusel topping. Bake for about 20 minutes or until a toothpick inserted in the center comes out clean. Remove muffins from oven and let cool slightly. Serve warm with vanilla honey butter.
Notes
The vanilla honey butter can be prepared up to 3 days in advance.