01 -
Switch oven to 350°F. Use parchment to line an 8x8 pan, with edges hanging for easy lift.
02 -
Melt butter and stir it with sugar, baking powder, and salt. Toss in oats and flour, saving 1 cup for topping.
03 -
Push leftover crumb mix into the pan. Cook for 12-14 minutes until edges darken a little.
04 -
Blend lemon zest, lemon juice, condensed milk, and leftover salt till it all comes together.
05 -
Spread filling on crust, sprinkle reserved topping, and bake for 22-24 minutes or until the top’s golden.
06 -
Let it sit and cool fully (about 90 minutes). Pop them in the fridge for half an hour for firm bars, then cut 12 pieces.