2 cups light brown sugar
5 ounces evaporated milk
1 cup unsalted butter
2 cups powdered sugar
½ teaspoon vanilla extract
½ teaspoon maple flavoring
1 cup coarsely chopped walnuts
1. Butter an 8x8-inch or 9x9-inch square pan. Line with parchment paper or foil, and butter that; set aside.
2. In a medium saucepan, combine the sugar, evaporated milk and butter. Bring to a full boil over medium heat. Reduce the heat slightly (no lower than medium-low) and boil for an additional 10 minutes, stirring constantly.
3. Remove from the heat and stir in the powdered sugar, vanilla extract and maple flavoring. Transfer the mixture to a standing mixer (or use a hand mixer) and beat the fudge on medium speed until thick and glossy - about 3 minutes. Fold in the walnuts and pour the mixture into the prepared pan.
4. Let the mixture cool to room temperature, then cover tightly and refrigerate overnight. Slice the fudge into 1-inch squares and serve. (Fudge can be stored at room temperature in an airtight container.)
Note: You can find the maple flavoring in the baking aisle where the vanilla extracts are.