Whisk together in the bowl of a stand mixer (or a large one if doing this by hand) your cream, milk, yolk, sugar and yeast.
Add in the flours and salt and knead in the mixer for about 8 minutes or by hand for about 10 minutes. Cover and allow to rise for 1 hour.
Line an 8”x8” square baking pan with parchment paper. Lightly flour your counter and gently scoop your dough over the flour. Press or roll the dough into a rectangle, widest from left to right, that measures about 12” by 10”. Spread the filling all over the dough.
Roll the dough upwards and away from your into a log. Once rolled up, cut the log of dough into 9 equal pieces. Place into the baking pan, cover and proof for 45 minutes to one hour.
Preheat your oven to 350°F. Once hot, place your baking pan inside and bake for about 30 minutes. Let the buns cool for at least 15 minutes before glazing.
FILLING
Melt the butter and stir into brown sugar and spice. Spread the filling over the dough and roll up as directed.
YOGURT GLAZE
Beat all of your ingredients together until smooth. Spread on cooled buns!