cup of...
dip+sweep
spoon
sifted
1 egg = 50g, in case you care. if you're brave: 1 tsp baking powder / baking soda / salt = 5g
simple substitutions:
buttermilk
2 tbsp lemon juice / vinegar + 1 cup milk
cake flour
2 tbsp cornstarch : 1 cup cake flour
1 unit butter
0.8 units oil, 0.2 units liquid
1 unit instant
1.25 units active dry yeast