Gluten-Free Sour Cream Coffee Cake

INGREDIENTS

• 2/3 cup chopped pecans
• 2 1/2 tablespoons brown sugar
• 2 teaspoons ground cinnamon
• 1 cup butter, softened
• 2 cups sugar
• 2 eggs
• 1 teaspoon vanilla extract
• 2 cups gluten-free baking mix (I use Bob's Red Mill)
• 1 1/2 teaspoons xanthan gum
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon baking soda
• 1/4 teaspoon salt
• 1 cup sour cream
• confectioners' sugar, for dusting