01 -
Set your oven to 177°C. Line an 8-inch (20 cm) square pan with parchment paper.
02 -
Combine flour, baking powder, salt, and oats. Mix on medium speed until you get a crumbly texture.
03 -
On medium-high speed, beat the brown sugar with softened butter for about a minute until smooth.
04 -
Beat in the vanilla extract for about 30 seconds until it's blended.
05 -
Take a bit more than half of the crumble mix and press it evenly into the bottom of the pan.
06 -
Bake this crust for 12 minutes and then take it out of the oven.
07 -
Whisk sweetened condensed milk, lemon juice, and lemon zest together until thick and smooth.
08 -
Spread the lemon mix evenly on top of the slightly baked crust.
09 -
Scatter the rest of your crumble mix evenly over the lemon layer.
10 -
Put it back in the oven for 22 to 25 minutes. Watch for golden edges and a firm center.
11 -
Cool the pan completely on a wire rack before cutting.
12 -
Lift out the bars using the parchment paper and cut into 16 pieces.
13 -
Keep at room temperature for a couple of days or chill in the fridge for up to a week.