Easy Chocolate Muffins from Betty Crocker

I love those chocolate muffins from Costco but I no longer have a membership because it's one of those places where I spend way too much. Making them is a good solution, right?

Ingredients:

• 1 cup buttermilk (or 1 cup milk + 1 tbsp of lemon juice standing for 5 minutes)
• 1/2 cup butter, melted
• 1 egg
• 1 cup all-purpose flour
• 3/4 cup whole wheat flour
• 3/4 cup packed brown sugar
• 1/2 cup unsweetened baking cocoa
• 1 teaspoon baking soda
• 1 teaspoon vanilla
• 1/4 teaspoon salt
• 1/2 cup semisweet chocolate chips

Preparations:

1. Heat oven to 375 degrees.
2. Line muffin pan with muffin (or cupcake holders). 
3. In medium bowl, mix buttermilk, butter, and egg until blended. 
4. Add flour, brown sugar, cocoa, baking soda, vanilla and salt until moistened. (Don't overbeat because it makes for dry muffins!)
5. Stir in chocolate chips. 
6. Divide batter equally among muffin holders. 
7. Bake 15 to 20 minutes or until toothpick inserted in center comes out clean. 
8. Cool 5 minutes, remove from pan.