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In the bowl of a stand mixer fitted with a dough hook, mix together the warm water and sugar. Then, mix in the yeast. Allow the mixture to sit for about 10-15 minutes.
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Melt 6 tbsp of butter in a microwave-safe bowl (save the remaining 1 tbsp for later). Mix the butter, buttermilk and eggs to the yeast mixture. Mix on low, and add about 2/3 of the flour to the bowl. Then, add the salt, continue to mix, and add the remaining flour. Mix with the dough hook for about 4-5 minutes. If the dough becomes too sticky, add more flour, 1 tbsp at a time. Lightly dust a work surface and knead the dough a few times.
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Spread the remaining 1 tbsp of softened butter on the inside of a medium-sized bowl. Put the dough ball into the butter-coated bowl and wrap tightly with plastic wrap. Let the dough rise for about 60 minutes.
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Meanwhile, make the cinnamon sugar filling by mixing the melted butter, brown sugar and cinnamon together.
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Preheat the oven to 350°F and prepare an 8" or 9" cast iron skillet by buttering the bottom and edges.
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Once the dough has nearly doubled in size, roll it out on a floured work surface into a large rectangle. Spread the cinnamon sugar filling on the inside, and roll the dough up from the long edge. Cut the roll into chunks, and arrange the chunks into a buttered skillet. Stuff the cut up strawberries around the chunks of dough. Using about 1/2 cup of Nutella and reserving the rest for later, spread dollops of Nutella within the chunks of dough and strawberries. Bake for about 20 minutes, and drizzle the remaining Nutella on top. Cool for about 15 minutes before serving. Enjoy!