Try the same as your bolie mix but instead of boiling add a little baking soda and place in baking tray and bake for about 15/20 mins depending on thickness. Use flavours as you would for bolies, colour not important it all looks the same from underneath! Can be helpful if fishing at distance to use colur so you can still see the bait.
the best and probably easiest way is to simply
buy a pkt of sponge mix from the supermarket pour
all the contents in a bowl add 6 med eggs approx,
you want a thick soup consistency add any flavours
etc and bake in oven in a casserole lid for about
15-20 mins and hey presto good luck