Corinne asked me to made this for her so I did!
I did have to make ajustment to the recipe, still it came out great!
this  recipe uses less than a half-cup of liquid for 2.25 cups of mix plus  the other dry ingredients and it  just made a crumbly mixture, so I  added 3/4 cups of milk to it and it turned out great!
                           (Adapted form Gluten-Free Made Simple)
6 tablespoons warm water (not hot)
2 teaspoon dry active yeast
2 tablespoons granulated sugar
1 tablespoon oil
1 1/2 teaspoons honey or agave nectar
1/2 teaspoon salt
1/2 teaspoon baking powder
2 1/4 cups gluten free flour mix 
4 tablespoons granulated sugar
2 teaspoons ground cinnamon
6 tablespoons butter, cut into 12 pieces
Heat oven to 375 degrees F.  Coat 6 jumbo muffin cups with nonstick cooking spray.
In a large mixing bowl, whisk together warm water, yeast, 2 tablespoons sugar, oil and honey; allow to sit 5 minutes.
Stir in salt, baking powder and gluten free flour until well combined.  Divide  1/3 of the batter into bottom of muffins cups.  
Stir together 4 tablespoons sugar and cinnamon until well combined.   Sprinkle 1 tablespoon of cinnamon-sugar on top of muffin batter.  Place a  piece of butter in center of each muffin cup.  Top evenly with  remaining batter.  Top with remaining cinnamon-sugar and butter pieces.   
Bake 20-22 minutes or until golden brown, well risen and bubbly.  Cool 5  minutes in pan before transferring muffins to a wire rack to cool
Makes 6 big muffins