Making the same food
When you open the cook book, under the food icons there are 'bars' like graphs , which seem to be at different 'stages'. They are actually to measure your experience in cooking that particular food. The more you cook it, the more bonus experience points you get. For example, baking cookies again and again (about 12 times) gained me the level of 'Apprentice in cookies' and I got 20 bonus XP points too! The more expensive the food and the longer it takes to cook... Obviously, the more the experience bonus :-)
You're better off cooking one food if each type repeatedly :-)
More tricks, tips and cheats for this game are right here - Bakery Story cheats
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