Preheat the oven to 350°F/180°C degrees and line an 8-inch square baking pan with parchment paper.
Whisk all ingredients, EXCEPT pecans, in a large bowl until well combined. Fold 2/3 of the chopped pecans into the batter and mix well.
Pour the batter evenly into the baking pan, and add the remaining pecans evenly on top of the spread-out batter.
Bake for 20-25 min or until it starts to get golden brown.
Remove from the oven and let cool for at least 20 minutes before serving. Serve with a vanilla ice cream on top.