One famous chef is not going to have as many helpers in the future. The Nebraska-based maker of Chef Boyardee and Healthy Choice frozen dinners is eliminating more than 100 jobs at its St. Louis office. ConAgra Foods is cutting its workforce from 450 employees to 320. A spokesman says the Omaha company acquired St. Louis-based Ralcorp in 2012 for about $5 billion. In February, ConAgra announced plans to trim $100 million in costs by the end of its 2016 fiscal year.