sweet potato struesel muffins

Ingredients

• 2 cups whole wheat flour ( i use freshly ground)
• 2 teaspoons baking powder
• 1 teaspoon nutmeg
• 1/2 teaspoon salt
• 1/2 cup honey
• 1/4 cup raisins (opt)
• 1 large egg
• 1 cup mashed sweet potato (1 small can usually)
• 1/2 cup milk
• 1/4 cup melted butter
• TOPPING
• 3 tablespoons brown sugar
• 1 tablespoon melted butter
• 2 tablespoons chopped nuts (opt)