preheat oven to 375F
cream together 1/3 cup softened butter + 1/2 cup granulated sugar + 1 tsp vanilla
microwave 1/2 cup milk of choice for 30 seconds and mix in
whisk in 1 egg just until combined
add in 1 1/3 cup all purpose flour + 1 tsp baking powder and stir all together
fold in 1 cup mixed berries + 1/4 cup berry jam of choice
scoop into oiled mini muffin pan (24 muffins total)
bake for 15-17 min or until toothpick comes out clean