Ingredients
Equipment
Method
Brown butter and prep
- Brown the butter until golden and nutty, then cool it for 10 minutes; look for toasted milk solids at the bottom.
- Preheat the oven to 350F and grease a 9x13 pan; the oven should fully come up to temperature before baking.
Mix dry and wet
- Whisk together the all-purpose flour, baking powder, cinnamon, cream of tartar, nutmeg, and salt; whisk until evenly combined with no visible streaks.
- Whisk the browned butter and packed brown sugar until smooth, then add the eggs and vanilla extract and whisk until glossy and uniform.
Assemble and bake
- Fold the flour mixture into the wet batter until just combined; stop when no dry flour remains.
- Fold in the finely diced apples so they’re evenly distributed throughout the thick batter.
- Spread the batter into the prepared 9x13 pan and level the top for even baking.
- Mix the cinnamon sugar topping (sugar and cinnamon) and sprinkle generously over the top; cover the surface in an even, speckled layer.
- Bake at 350F for 25-30 minutes until a toothpick comes out with just a few crumbs; the edges should look set while the center is lightly soft.
Finish
- Drizzle with caramel sauce over the cooled blondies; finish with stripes across the surface.
- Cool completely before slicing so the bars hold their shape and the apple pieces stay tender.
Notes
Pro tip: let the browned butter cool the full 10 minutes so the eggs don’t scramble when mixed. Store airtight at room temperature for up to 2 days or refrigerate up to 5 days; rewarm briefly if you like. Freeze baked bars (without slicing) up to 2 months, thaw overnight in the fridge. For a lighter option, swap half the brown sugar for an equal amount of light brown sugar or use a 1:1 baking sweetener blend if you prefer less sugar.
