Poke the sweet potatoes with a fork and wrap in foil. Bake at 400 degrees Fahrenheit for 45-50 minutes until the potatoes are soft. You may need more cook time depending on the size of your sweet potatoes.
Allow the sweet potatoes to cool.
Reduce the oven temperature down to 350 degrees Fahrenheit.
Line an 8X8 baking dish with parchment paper.
Crush up the graham crackers in a food processor to make graham cracker crumbs.
Mix together the crust ingredients in a medium size mixing bowl. Then press this mixture into the bottom of the 8X8 baking pan.
Bake the crust for 15 minutes to 25 minutes.
While the crust is baking, prepare the filling mixture. Remove the foil and the skin from the sweet potatoes.
Place the sweet potatoes in a large bowl. Add in all the other filling ingredients to the bowl. Mix until thoroughly combined.
Pour the filling over the crust and bake for 35 to 45 minutes. Cook until a toothpick inserted into the center comes out clean.
Let the bars cool completely at room temperature. Then chill in the refrigerator for at least 4 hours or until ready to serve.
When serving, top with the mini marshmallows and broil for 2-3 minutes to brown the marshmallows slightly.
Slice into squares and the bars are ready to serve and enjoy.
Notes
Refrigerate the leftovers in an airtight container for up to 1 week.