Baking

Mars Bar slice

Name: Mars Bar slice
Prep time: 15 min
Cook time: 10 min
Total time: 25 min
Yield: 14 pieces
Cuisine: Australian
Ingredients: 4 × 60 g Mars Bars, chopped; 100 g unsalted butter, chopped; 105 g (3 cups) Rice Bubbles; 200 g milk or dark chocolate, chopped; 2 tsp vegetable oil

Serves 14 pieces Prep 15 min Cook 10 min Total 25 min (+ chill)

Mars Bar slice is a baking staple we keep on Scoops & Dishes because it rewards a clear metric method: grams and millilitres, Australian cups (250 ml), and steps you can follow without scrolling past a novel. As written it serves 14 pieces. Budget about 15 min to prep and 10 min to cook or bake, roughly 25 min (+ chill) all up, across 5 ingredients and 4 method steps. Key building blocks: × 60 g Mars Bars, unsalted butter and Rice Bubbles. If you need a substitute, change one thing at a time and expect the texture notes below to matter more than the timer. After cooking, cool on a rack, then slice or pack once firm. One tray or tin as written — freeze extras in airtight bags. If humidity or a fan oven changes browning, trust visual cues over the last minute of the clock. Everything on this page is metric-first for Australia. If you are converting from cups on an old card, weigh flour, sugar, and butter whenever the ingredient line shows grams.

Ingredients

4 × 60 g Mars Bars, chopped
100 g unsalted butter, chopped
105 g (3 cups) Rice Bubbles
200 g milk or dark chocolate, chopped
2 tsp vegetable oil

Method

Grease and line an 18 × 28 cm slice pan.
Stir Mars Bars and butter over low heat 5 minutes until smooth.
Stir into Rice Bubbles. Press into pan. Fridge until firm.
Melt chocolate with oil; spread over slice. Fridge until set. Cut with a hot knife.

Tip: Mixture may look separated when melting — keep stirring.

Notes

Putting it together for Mars Bar slice: work clean, taste as you go, and do not rush browning or reduction steps if they appear in the method. If you are cooking for mixed diets, plate sauces and toppings separately where practical. Keep this page bookmarked if it becomes a household regular — we update wording when cooks report a confusing step. Metric consistency across Scoops & Dishes means once you trust the cups and scales here, breakfast through dessert behaves the same way.
Before the heat goes on, line up × 60 g Mars Bars, unsalted butter and Rice Bubbles and anything perishable from the list. Soften butter, bring eggs off the fridge if the method needs them room-temp, and preheat so you are not waiting mid-recipe. For a baking cook of this size (14 pieces), a clear bench saves more time than any gadget.
Why this page is written this way: we keep the story short and put the value in practical detail — ingredient order, heat cues, and storage — because that is what helps a home cook succeed on a Tuesday night. If a step feels unclear, email [email protected] and we will tidy the wording on the next pass.
Shopping and mise en place: read the full ingredient list once before you start. For Mars Bar slice, × 60 g Mars Bars and unsalted butter are the items that decide whether the dish tastes flat or properly seasoned. Weigh where grams are given — volume cups are fine for liquids and some dry goods, but baking ratios are tighter if you use scales. Australian cups are 250 ml; a tablespoon is 20 ml and a teaspoon is 5 ml.