Apple Zucchini Muffins

Ingredients

• 1 cup all-purpose flour
• 1/2 cup whole wheat flour
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1 teaspoon cinnamon
• 1/4 teaspoon nutmeg
• 1/4 teaspoon cardamom
• 1/4 teaspoon salt
• 3/4 cup granulated sugar
• 1/4 cup grape seed oil, canola oil, or other neutral-flavored oil
• 1/4 cup applesauce
• 1 large egg
• 1 yolk from a large egg
• 1/2 teaspoon vanilla extract
• 3/4 cup shredded zucchini, drained and squeezed (see Recipe Note)
• 1/2 cup diced apple (diced small)
• 2 tablespoons unsalted butter, softened
• 1/4 cup brown sugar
• 1/2 cup quick oats
• 1 1/2 teaspoons cinnamon
• 2 tablespoons all-purpose flour
• 3/4 cup crème fraîche
• 1 tablespoon honey, or to taste