Creating S’mores Muffins is straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, cocoa powder, baking powder, and salt.
3. Combine Wet Ingredients: In another bowl, whisk the milk, vegetable oil, eggs, and vanilla extract until well combined.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, stirring until just combined.
5. Add Chocolate Chips: Fold in the semi-sweet chocolate chips gently.
6. Prepare Muffin Tin: Spoon half of the batter into the prepared muffin tin, filling each cup about halfway.
7. Add Marshmallows: Drop a few mini marshmallows into each muffin cup, then top with the remaining batter until filled about ¾ full.
8. Add Topping: Sprinkle the tops of the muffins with graham cracker crumbs and extra chocolate chips and marshmallows.
9. Bake: Place in the preheated oven and bake for 15-20 minutes or until a toothpick inserted in the center comes out clean.
10. Cool: Remove from the oven and let the muffins cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.

These steps will guide you in creating these incredible muffins effortlessly.