Ingredients
- 1 (18.3 oz or 520 g) box of Chewy Fudge Brownies mix (I used Duncan Hines)
- 4 large eggs at room temperature, divided
- ¾ cup vegetable oil
- 1-1/2 tablespoons pure vanilla extract, divided
- ¼ cup water
- ½ cup canned sweet potatoes, drained and mashed
- ½ cup firmly packed light brown sugar
- ⅓ cup unsalted butter, softened
- ½ cup granulated sugar
- 1 teaspoon apple pie spice
- 1 teaspoon baking powder
- 1 cup all-purpose flour
- 2-1/2 to 3 cups miniature marshmallows
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