Rhian, whose business is worth $20 million ($21.7m) and has helped hundreds of thousands of Australian women lose weight, says she wants to show busy mothers how healthy eating doesn't have to be expensive.
She said she cooked her week's meals in advance, which took her three hours in total on one Sunday night.
She made enough dinners to feed a family of four over five nights, as well as three extra portions.
She managed to spend just £36 ($69.71) on the ingredients, and bought everything from UK supermarket Tesco.
Her ethos is that no dietary group is cut out or restricted but all meals are nutritious and healthy.
Every recipe she made is taken from her 28 Day Weight Loss Challenge, which she has created more than 4000 recipes for.
She said: "This took me three hours to do which means I don't have to cook again for the week.
"Because I'm cooking in bulk, I'm saving so much money – so although it is hard work – it is 100 per cent worth it!"
The meals vary in cost per serving per person but her cheapest meal - a courgette and cheese strata (aka a savoury bread pudding) - costs just 72p ($1.39) per person.
Rhian added: "The meals are designed with a holistic approach, with no food group being cut out, everything in moderation and most importantly, they're delicious."
