In a mixing bowl, combine 1 cup flour and yeast. Set aside. In a saucepan, heat the milk, 3 tablespoons butter, sugar, and salt until 120 degrees F. Remove from heat and stir until the butter is melted.
Add to the flour and yeast. Mix on low using a regular paddle, or by hand. Add the egg. To the dough, add the remaining flour a little at a time until a soft dough forms.
Increase speed to medium until a soft dough forms. Turn out onto a lightly floured surface and knead for 3 to 5 minutes. Transfer the dough to a lightly greased bowl, turning once to coat both sides. Cover with a clean dish towel.
Allow the dough to rise in a warm place until doubled, about 1 ½ hours. Punch the dough down and turn out onto a floured surface. Cover and allow to rest for 5 to 10 minutes. Combine the filling ingredients until sandy.
Roll the dough into a rectangle, approximately 20 inches by 10 inches. Sprinkle with the filling mixture, leaving a 1-inch space on one long edge without filling. Starting on the long side, roll the dough up, working it tightly but without pulling the dough too much.
Seal the long edge by pinching it shut. Cut the dough into 12 even slices by cutting the dough in half, cutting those halves in half and then the quarters into three slices each. Line a 5 to 6 quart slow cooker with parchment paper.
Spritz the parchment paper with nonstick cooking spray. Place the cinnamon rolls into the slow cooker. Wrap a towel around the lid and cover the slow cooker. serve.
Cook on high for 1 to 1 ½ hours or until the cinnamon rolls are cooked through. While the rolls bake, combine the cream cheese, butter, and vanilla, stirring until well blended.
Add the milk a little at a time until reaching the desired consistency. Remove rolls from the slow cooker using the parchment paper to lift. Spread the cinnamon rolls with icing and enjoy.
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Notes
Slow Cooker Apple Cinnamon Rolls
If you want to add apples you can dice 1/2 of an apple, peeled, and add it into your middle filling layer, or pour a can of apple pie filling on to the bottom of slow cooker with rolls on top