Butterscotch Marshmallow Bars – Gooey, Chewy & Old‑Fashioned
Introduction
These bars are the kind of treat that feels straight out of grandma’s kitchen: buttery, chewy, and loaded with gooey marshmallows and rich butterscotch flavor. They’re quick to make, irresistibly sweet, and perfect for potlucks, bake sales, or cozy nights in.
Why You’ll Love This Recipe
Soft, chewy texture with gooey marshmallows
Rich butterscotch flavor balanced with buttery base
Easy one‑pan recipe — no fuss
Nostalgic, old‑fashioned dessert that disappears fast
Perfect for holidays, gifting, or everyday indulgence
Ingredients
##Bars
½ cup unsalted butter
1½ cups packed brown sugar
2 large eggs
2 tsp vanilla extract
1½ cups all‑purpose flour
1 tsp baking powder
½ tsp salt
1 cup butterscotch chips
2 cups mini marshmallows
½ cup chopped pecans or walnuts (optional)
Step‑by‑Step Instructions
Prepare pan: Preheat oven to 350°F (175°C). Grease and line 9×13 pan with parchment.
Melt butter: In saucepan, melt butter over low heat. Stir in brown sugar. Cool slightly.
Add eggs: Whisk in eggs and vanilla until smooth.
Mix dry ingredients: Whisk flour, baking powder, salt. Stir into wet mixture until just combined.
Fold in mix‑ins: Add butterscotch chips and nuts if using.
Bake: Spread batter in pan. Bake 20–25 minutes until edges golden and center just set.
Add marshmallows: Sprinkle marshmallows over hot bars. Return to oven 2–3 minutes until soft and lightly golden.
Cool & slice: Let cool completely. Slice into squares. Optional: drizzle with melted butterscotch chips.
Tips for Success
Don’t overbake — bars should stay soft and chewy.
Let butter mixture cool slightly before adding eggs.
Toast pecans for deeper flavor.
Keep marshmallows in oven only briefly for gooey finish.
Chill bars 20–30 minutes before slicing for neat edges.
Serving Suggestions
Perfect for bake sales or potluck trays
Wrap individually for edible gifts
Pair with coffee or hot cocoa
Lovely addition to holiday dessert platters
Serve warm for extra gooey texture
Kitchen Science Corner
Brown sugar adds moisture and caramel notes.
Butterscotch chips melt into pockets of sweetness.
Marshmallows soften into gooey topping.
Eggs provide structure while butter adds richness.
Storage & Make‑Ahead
Store airtight at room temp up to 3 days.
Refrigerate up to 5 days for firmer texture.
Freeze up to 2 months; thaw before serving.
Best enjoyed slightly warm for gooey marshmallow finish.
Final Thoughts
These Butterscotch Marshmallow Bars are gooey, chewy, and irresistibly nostalgic. With their buttery base, rich butterscotch flavor, and soft marshmallow topping, they’re a dessert that feels both playful and comforting — perfect for sharing or savoring solo.