Sieve flour & baking powder together into a large bowl
Add sugar & stir
In a separate bowl add sour cream, eggs, lemon zest, oil, vanilla & mix together
Pour the wet liquids into the dry ingredients and fold together
Add berries & chocolate and fold in together
Pour into muffin trays and bake @ 180c (360f) for 22 mins or until a skewer comes out clean
Notes
Tips/Tricks
mix the ingredients by hand (spatula) - it's less washing up and I find the more gentle you are when making muffins the lighter they are too
"folding" this is a method where you run the spatula around the outside of the mixture and fold it back in on top. This keeps the muffin mixture aerated
let them cool before you dive in. They don't need to be stone-cold but give them a chance to cool down so you don't burn yourself but also so they don't fall apart instantly