In a large saucepan set over medium heat, combine the creamer, butter, and granulated sugar. Stir occasionally as the butter melts and the mixture warms. Once the butter is fully melted and the creamer is steaming, remove the pan from heat and allow it to cool to room temperature. This may take about 30 minutes; use a thermometer to check when the mixture reaches 110°F.
Stir the yeast into the lukewarm mixture and let it sit for approximately 5 minutes, until it turns slightly foamy, indicating the yeast is activated.
Add 4 cups of the flour along with the baking powder, baking soda, and salt. Stir until the dough just comes together—it will be sticky. Cover the saucepan with a clean towel and allow the dough to rise until doubled in size, about 1 hour. If your kitchen is cool, briefly preheat the oven to 200°F, turn it off, and let the dough rise inside.
After the dough has risen, add the remaining ½ cup flour and stir gently until incorporated. Optionally, refrigerate the dough for 1–2 hours to make it easier to handle.
Lay out two sheets of wax paper and sprinkle 2 tablespoons of flour over the surface. Place the dough onto the wax paper and lightly dust the top with 1 more tablespoon of flour. Roll the dough into a large rectangle approximately 20 inches by 16 inches.