1/2 cup packed light brown sugar
4 tablespoons oil
1/4 cup gluten-free flour
2 teaspoons cinnamon
2 cups flour
2 teaspoons baking powder
1 teaspoon baking soda
1/2 teaspoon salt
1/2 cup oil
1/2 cup sugar
1/2 cup buttermilk
1 teaspoon vanilla extract
Combine all the cinnamon ripple ingredients in a mixing bowl and use an electric mixer to blend them. Set the mixture aside.
Preheat heat the oven to 400° F and put inserts into muffin cups.
In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.
In a large bowl, beat the butter and sugar with an electric mixer until the mixture is pale and fluffy, then beat in the eggs, buttermilk, and vanilla extract.
Stir in the dry ingredients just until the batter is blended.
Then sprinkle the cinnamon ripple over the batter and use a flexible spatula to fold it in a couple of times.
Divide the batter among the muffin cups and …