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Buttery oat cookie bars swirled with a fudgy condensed-milk chocolate layer for a chewy, sliceable dessert traybake.
Chocolate revel bars are built on contrast: an oat-heavy base that bakes chewy at the edges, and a condensed-milk chocolate filling that stays softer in the middle. That mix is what makes them feel more substantial than a standard bar cookie.
They are also practical for sharing. The slab cools well, slices cleanly after a short chill, and travels better than a frosted dessert.
Because there are two textures in one pan, it helps to think of the bake as a balance. The oat dough should stay thick enough to hold the filling, and the chocolate layer should stay rich without turning runny.
Pressing the base firmly into the tin gives the bars more structure and keeps the bottom layer from crumbling after baking.
Cooling fully before cutting matters just as much. A short chill firms the chocolate layer and makes neater squares with less dragging.
Serve revel bars at room temperature or slightly cool if you want the cleanest texture. They work well on dessert platters, snack trays, and potluck tables.
Store them in an airtight container for several days. If stacking, separate the layers with parchment so the tops do not stick.
They also work well as a make-ahead tray bake because the flavor settles a bit after cooling. By the next day the oat base and chocolate layer feel more cohesive, which makes the bars easier to portion for sharing.
That is also why they fit well on dessert trays. They slice neatly, travel better than frosted bakes, and still feel rich enough to stand out among other bar cookies.
Buttery oat cookie bars swirled with a fudgy condensed-milk chocolate layer for a chewy, sliceable dessert traybake.

Line the tin and leave a parchment overhang to lift the slab out cleanly.
Press the oat base firmly so the bars hold together and don’t crumble.
Chill the baked slab 1–2 hours before slicing for neat squares.
Swap half the dark chocolate for milk chocolate if you prefer it sweeter.
Add 60–80 g chopped walnuts or pecans for crunch, if desired.
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Heat oven to 180°C (350°F). Line a 20cm/8in square tin with parchment, leaving overhang.
In a bowl, whisk melted butter and brown sugar. Beat in the egg.
Fold in flour, baking soda, and oats until a thick dough forms.
Reserve about one third of the oat dough for the top; press the remaining dough evenly into the lined tin.
In a small saucepan over low heat, melt chocolate, condensed milk, and butter, stirring until glossy and smooth.
Pour over the pressed oat base and spread to the corners.
Dot and lightly flatten pieces of the reserved oat dough over the chocolate.
Bake for 40–45 minutes until the top is set and lightly golden at the edges.
Cool completely in the tin, then chill 1–2 hours for clean slices.
Lift out using the parchment and cut into 12 bars.
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Serving Size: 1 bar
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
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