PREHEAT AND PREP PANS: Preheat the oven to 350°F. Grease two 9 x 13 inch baking dishes with 1 tablespoon unsalted butter.
ACTIVATE YEAST: In the bowl of a stand mixer, combine 1 cup warm water and ½ cup granulated sugar. Sprinkle 2 ¼ teaspoons active dry yeast over the top and stir gently. Let sit for 5 to 10 minutes until foamy.
MELT BUTTER: Melt the remaining 7 tablespoons unsalted butter and set aside to cool slightly.
MAKE DOUGH: Add ¼ cup buttermilk, 2 large eggs, and the melted butter to the yeast mixture. Mix on low speed. Add 4 cups all-purpose flour, 1 cup at a time, then add 2 teaspoons kosher salt. Continue adding flour slowly until a soft dough forms, about 5 ½ to 6 cups total.
KNEAD DOUGH: Knead with a dough hook on medium speed for 5 minutes until the dough is smooth and slightly tacky. The dough should be soft but not sticky.
FIRST RISE: Transfer the dough to a lightly greased bowl if needed. Cover loosely and let rise in a warm place for 60 to 90 minutes until doubled in size.
MAKE FILLING: In a medium bowl combine 1 ½ cups packed light brown sugar, 2 tablespoons ground cinnamon, and 1 tablespoon cornstarch. Stir until well combined.
ROLL DOUGH: Turn the dough onto a lightly floured surface and roll into an 18 x 24 inch rectangle.
ADD FILLING: Spread ½ cup softened butter evenly over the dough, leaving a 1 inch border along one long edge. Sprinkle the brown sugar mixture evenly over the butter and press gently so it sticks.
ROLL AND CUT: Starting from the long edge, roll the dough tightly into a log. Pinch the seam to seal. Cut into 12 equal rolls.
SECOND RISE: Place 6 rolls in each prepared baking dish, spacing them evenly. Cover and let rise for 60 to 90 minutes until doubled in size.
BAKE: Bake for 18 to 22 minutes until golden brown, rotating pans halfway through baking.
MAKE FROSTING: In a large bowl beat 4 ounces cream cheese and ¼ cup butter until smooth and fluffy. Add 1 cup powdered sugar, ½ tablespoon lemon juice, 1 teaspoon vanilla extract, and ½ teaspoon kosher salt. Beat for 3 to 5 minutes until light and creamy.
FROST ROLLS: Spread half of the frosting over the warm rolls. Let cool slightly, then spread the remaining frosting on top.
SERVE: Serve warm and enjoy.
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Notes
Make-Ahead: Assemble the rolls and place them in the baking dishes. Cover and refrigerate overnight. Let sit at room temperature for 30 minutes before baking.Storage: Store leftover rolls in an airtight container at room temperature for up to 2 days or refrigerate for up to 4 days.Reheating: Warm individual rolls in the microwave for 15 to 20 seconds or reheat in a 300°F oven for 8 to 10 minutes.Freezing: Freeze baked rolls in an airtight container for up to 2 months. Thaw overnight in the refrigerator before reheating.Ingredient Tip: The dough should feel soft and slightly tacky. Avoid adding too much flour or the rolls will be dense.