Instructions
Step 1: Preheat oven to 350°F (175°C). Line a 12-cup muffin tin with paper liners.
Step 2: In a bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
Step 3: In a large bowl, whisk melted butter and sugar until smooth. Add eggs one at a time, mixing well, then stir in yogurt and vanilla.
Step 4: Gradually fold in the dry ingredients until just combined. Do not overmix.
Step 5: Divide the batter into two bowls. Stir cocoa powder into one bowl to create the chocolate batter.
Step 6: Spoon a tablespoon of vanilla batter into each muffin liner, place a piece of chocolate bar in the center, then cover with a mix of vanilla and chocolate batter. Swirl lightly with a toothpick for a marbled effect.
Step 7: Bake for 18–20 minutes, or until muffins are risen and a toothpick inserted (avoiding the chocolate center) comes out clean.
Step 8: Allow to cool slightly before serving — the centers will be melty and delicious!
Tips & Secrets
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Use high-quality chocolate squares for a gooey, rich center.
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Do not over-swirl the batters; light swirls create the best marbled effect.
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For taller muffin tops, fill the liners almost to the top.
Serving & Storage
Serve warm for the ultimate molten chocolate experience, or let them cool completely for a fudgy center. Store in an airtight container at room temperature for up to 3 days, or refrigerate for up to 5 days. Can be frozen for up to 2 months.
Variations
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Replace milk chocolate with white chocolate for a creamy twist.
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Add chocolate chips or nuts into the batter for extra texture.
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Make them double chocolate by adding cocoa powder to the entire batter.
Conclusion
These Marble Chocolate Surprise Muffins are fluffy, swirled, and filled with a gooey chocolate heart. They look bakery-perfect but are simple enough to make at home. Serve them for breakfast, dessert, or a special treat — one bite and you’ll be hooked!
