Preheat the oven to 350℉. Line a sheet pan with parchment paper.
In a mixing bowl, combine the cake mix, eggs, and oil. Stir until well combined.
1 15.25 ounce box spice cake mix, 2 large eggs, ⅓ cup canola oil
Using a 1-tablespoon cookie scoop, portion the dough out onto the sheet pan. Bake for 8-10 minutes. The cookies will be set but will look slightly underdone in the middle. Let the cookies cool on the pan for 5 minutes before transferring to a cooling rack.
For the frosting, add the butter to a small skillet set over low heat. Melt the butter and continue to heat until the butter turns golden brown, stirring occasionally. Brown bits will form in the bottom of the pan. This will take about 5 minutes. Cool slightly.
2 tablespoons unsalted butter
In a mixing bowl, combine the powdered sugar, maple extract, brown butter, and cream. Stir or whisk until the frosting has a smooth consistency. Additional cream can be added a little at a time to achieve the desired spreading consistency.
1 ½ cups powdered sugar, 1 teaspoon maple extract, 2 tablespoons heavy cream
Using an offset spatula, top each cookie with the frosting.
Store the cookies in an airtight container with parchment paper between the layers. The cookies will keep for up to 4 days.
Notes
The most commonly sold cake mix size is 15.25 ounces. If you are using an 18.25-ounce box of cake mix, increase the oil to ½ cup.
The dough can be chilled for 15-20 minutes if desired but it is not required.
For thinner cookies, flatten the dough balls with a glass before baking.