Mix all the dry ingredients (bread flour, instant yeast, sugar, salt, and baking powder ) in a clean mixing bowl.
Add the pumpkin puree and water to the dry ingredients
Knead the dough by hand (or using a stand mixer) for about 1-2 minutes, until all the ingredients are mostly combined.
Add the olive oil and continue to knead for about 8 to 10 minutes, or until the dough pulls away from the bowl and forms a smooth, supple ball.
Note: Additional 1-2 Tablespoons of water (or additional bread flour) may be necessary depending on the protein content of the flour, the water content in the pumpkin, as well as the humidity and temperature of the kitchen.
Remove the finished dough from the mixer bowl and place in a lightly greased bowl.
Cover and let rise until doubled, about 60-90 minutes***
Prepare filling by scooping or rolling prepared pumpkin spice paste (or other filling of choice) into 2-3 Tbsp sized balls
When the dough is ready, punch down the dough then remove from bowl. Place on a generously floured surface and divide into 12-14 equal sized pieces.
Wrap the dough pieces around the filling and place them on a piece of parchment square, or a sheet of steamer paper.
Cover and let rise for 20-30 minutes.
Meanwhile, boil water and prepare the steamer
Transfer the buns to the steaming pan and steam the buns for 15 minutes
Gently remove from steamer pan with a spatula (tongs are not recommended since they ruin the shape of the buns). Enjoy!
Serve while warm. Enjoy!
Note: You can store these steamed buns, well wrapped, at room temperature for up to 1 day. For longer storage, you can place them in a plastic freezer bag or airtight container and freeze up to 3 months, then defrost them at room temperature or steam them again for just 10 minutes to enjoy them just like fresh.