Ingredients
Streusel Topping
- 3 tbsp unsalted butter, melted
- 3/4 cup graham cracker crumbs
- 1 1/2 tbsp sugar
Dry Ingredients
- 2 cups all purpose flour (240 grams)
- 1/3 cup cocoa powder (33 grams)
- 1/2 cup sugar (100 grams)
- 2 tsp baking powder
- 1/2 tsp baking soda
- 1/2 tsp kosher salt
- 1/2 cup chocolate chunks or semi-sweet chocolate chips (plus more for garnish)
Wet Ingredients
- 4 tbsp unsalted butter, melted
- 4 oz chocolate, melted
- 1/2 cup vegetable oil
- 1/2 cup whole milk (or milk of choice)
- 1/2 cup Greek yogurt
- 2 large eggs
- 1 tbsp vanilla extract
Mix-ins and Garnish
- 1 cup mini marshmallows (plus more for garnish)
Instructions
- Make the streusel topping: In a small bowl, melt 3 tablespoons of unsalted butter in the microwave for 30 seconds or until fully melted. Add 3/4 cup graham cracker crumbs and 1 1/2 tablespoons sugar. Mix together until the texture resembles wet sand. Chill in the refrigerator while preparing the muffins.
- Preheat and prepare muffin tin: Preheat your oven to 425°F (220°C). Spray a muffin tin generously with baking spray and line with muffin liners for easy removal.
- Mix dry ingredients: In a medium bowl, whisk together 2 cups flour, 1/3 cup cocoa powder, 1/2 cup sugar, 2 teaspoons baking powder, 1/2 teaspoon baking soda, and 1/2 teaspoon kosher salt. Stir in 1/2 cup chocolate chunks to coat them in the dry mix.
- Melt chocolate and butter: In a separate medium bowl, microwave 4 tablespoons of unsalted butter and 4 ounces of chocolate in 30-second increments until smooth and fully melted. Stir well to combine.
- Combine wet ingredients: Add 1/2 cup vegetable oil, 1/2 cup whole milk, 1/2 cup Greek yogurt, 2 large eggs, and 1 tablespoon vanilla extract to the melted chocolate and butter mixture. Whisk all wet ingredients thoroughly to combine.
- Add dry ingredients to wet: Pour the dry ingredient mixture all at once into the wet ingredients bowl and stir lightly.
- Add marshmallows and fold batter: Gently fold in 1 cup mini marshmallows using a large spatula. Carefully fold just until no large streaks of flour remain; the batter should be lumpy and not overmixed.
- Fill muffin tin: Using an ice cream scoop for accuracy, fill each muffin cup to the top with batter.
- Add garnish: Top each muffin with a few additional chocolate chunks and more mini marshmallows for an extra gooey top.
- Sprinkle streusel: Generously sprinkle the chilled graham cracker streusel evenly over the top of each muffin for added texture and flavor.
- Bake the muffins: Bake at 425°F (220°C) for 7 minutes. Then reduce oven temperature to 350°F (175°C) and continue baking for an additional 13 minutes, until a toothpick inserted near the center comes out clean or with a few moist crumbs.
- Cool and serve: Remove muffins from oven and let cool in the pan for 5-10 minutes. Use a knife or offset spatula to carefully remove muffins from the tin and transfer to a wire rack to cool completely before serving.
Notes
- Do not overmix the batter to keep muffins light and tender.
- Use semi-sweet chocolate chips for the best balance of sweetness.
- You can substitute milk with almond, oat, or soy milk if preferred.
- For crispier tops, you can broil the muffins for 1-2 minutes after baking if desired.
- Store muffins in an airtight container at room temperature for up to 3 days, or freeze for longer storage.
- Prep Time: 20 minutes
- Cook Time: 20 minutes
- Category: Baking
- Method: Baking
- Cuisine: American