01 -
Set your oven to preheat at 350°F. Use two strips of parchment paper to line an 8x8 pan with some overhang for easy lifting later.
02 -
Melt the butter and stir it together with brown sugar, baking powder, and a portion of the salt. Add in the oats and flour. Set 1 cup aside for the crumbles on top.
03 -
Take the leftover crumb mix and press it firmly into the base of your pan. Pop it in the oven until it turns golden, about 12-14 minutes.
04 -
In a bowl, mix the lemon zest, juice, condensed milk, and the pinch of salt left over. Whisk it until it looks smooth and creamy.
05 -
Pour the lemon mixture over the hot crust. Scatter the reserved crumb mixture on top and bake again for 22 to 24 minutes, until edges are browned.
06 -
Let it cool on the counter completely, around 1 1/2 hours. You can chill in the fridge for 30 minutes if you want them firmer. Slice into 12 squares.