Preheat the oven to 375 degrees and prepare a 9x13 baking pan with cooking spray. Set aside.

In a small frying pan over medium heat, melt 1 Tablespoon of the butter and add the onion. Cook slowly over medium heat until the onion starts to turn golden brown. (About 3-5 minutes) Remove from heat and set aside to cool. Once cooled, blot the onions to remove as much moisture as possible.

In a large mixing bowl, whisk together the flour, granular sugar, yeast, salt and onion powder until well combined. Set aside.

In a microwave safe small bowl combine the milk, water and 2 remaining Tablespoons of butter. Heat in the microwave in 20 second intervals until the temperature reaches 120-130 degrees.

Move the heated milk mixture to a larger bowl and combine with ½ cup of the flour mixture. Use an electric mixer on low speed to mix until combined.

Add about ½ cup of the prepared, blotted onions and continue mixing until fully incorporated.

Slowly add the remaining flour, ½ cup at a time until the dough resembles a thick and slightly sticky playdough.

Move the prepared dough into the bowl of a stand mixer and use the dough hook to knead for 6-8 minutes on low. Alternatively, you can knead the dough by hand on a prepared floured surface. The dough is ready when you can press it and it returns back to shape.

Cover the dough and move to a warm area to rest for about 10-15 minutes, the dough will rise slightly.

Separate the dough into 12 evenly sized rolls and shape if needed. Place them in a prepared dish.

Cover and set aside to rise for about 20-30 minutes.

Melt the remaining butter and add the remaining onions to it. Brush this mixture over the rolls until the tops are completely coated.

Bake for 25-30 minutes or until the tops are golden brown and the rolls are baked through.