Gather the ingredients and preheat the oven at 375℉.
The Mixing
In a large mixing bowl, whisk together the 375 g all-purpose flour, 2 tsp baking powder, 0.5 tsp baking soda and 0.5 tsp salt.
In another mixing bowl, whisk together the 355 ml milk, 200 g sugar, 115 g unsalted butter, 2 eggs, 2 tsp. vanilla extract, 1 lemon zestand 1 lemon juice.
Add the dry flour mixture to the wet ingredients and mix to combine, until there are no pockets of dry flour left. Gently fold in the 310 g mixed berries and 100 g cranberries, just until evenly distributed.
The Baking
Spoon batter into lined muffin pan, filling almost to the top.
Bake at 375℉ for about 25 minutes or until risen and just starting to turn golden on top.
The Serving
Enjoy them warm or at room temperature; they pair beautifully with tea or coffee, making for a delightful healthy breakfast or a satisfying dessert.