In a large mixing bowl, whisk together the pumpkin purée, brown sugar, eggs, maple syrup, pumpkin pie spice, salt, and baking powder until smooth.
Add the milk to the bowl and whisk until smooth.
Stir the oats into the pumpkin mixture.
Pour the mixture into a divided sheet pan, or 8×8-inch baking dish (see notes below). Spread evenly to ensure consistent cooking.
Bake in the preheated oven for 35 minutes, or until the center is set and the edges are lightly golden brown. The baking fills your kitchen with a wonderful fall aroma!
Serve these bars hot from the oven for a comforting treat, or let them cool, refrigerate, and enjoy as a chilled snack.
Video
Notes
For Serving:
You can eat these as-is or top with whipped cream
For baking in 8x8 baking pan
This will cause the mixture to be thicker, than if you used a sheet pan. Check to see if it's done around the 35 minute mark, but you'll probably need 40-45 minutes for it to cook all the way through.