Burtons Foods will launch Cadbury Milk and Cadbury Fruit Digestives this month, and claims it will create a £6m brand within three years.
The lines will be backed by an initial ad budget of £1.5m.
The company believes that the popularity of Cadbury chocolate will revitalise the everyday treat biscuit sector, which experienced a 2.4% decline in value in the year to June, according to Information Resources.
Burtons claims that market research shows that 75% of consumers are likely to purchase Cadbury Digestives, and 52% prefer them to their current chocolate digestive brand.
Each biscuit in the range is semi-coated in Cadbury chocolate. They will be sold in 400g packs, priced 99p.
McVitie's Digestives sales fell by 5.3% in the year to June 2003, according to Information Resources.