Step 1

Butter a 9" square baking dish. Line the bottom of the dish with parchment paper. Butter and flour the parchment paper.

Step 2

Pre-heat the oven to 350°F

Step 3

Whisk together flour, baking powder, baking soda and salt in a small bowl.

Step 4

Beat maple syrup, butter and sugar 3-5 minutes, until fluffy. Beat in eggs, one at a time. Mix in vanilla.

Step 5

Add flour mixture in 2 batches, alternately with two batches of the sour cream to the mixer. Beat until combined.Add flour mixture in 2 batches, alternately with two batches of the sour cream to the mixer. Beat until combined.

Step 6

Pour batter into buttered baking dish, bake at 350°F for 25-35 minutes, until golden on top.

Step 7

Remove cake from oven, let cool for 10 minutes before removing from the pan and letting cool completely on a rack.

Step 8

To make the icing for the cake. Mix together maple syrup, melted butter and icing sugar. Add more maple syrup or icing sugar, depending on the consistency of the icing.

Step 9

Spread icing on the completely cooled cake.