Having entered at the third round stage, Aveley Youth beat Hutton 4-1 before waltzing past Leigh Ramblers 5-1 to set up a quarter final with East Thurrock United last month.
After the tie ended 1-1 and the two sides couldn't be separated during extra time the contest went to a penalty shoot out, with the Millers holding their nerve to win 5-4.
The win puts them just one more win away from the Essex County Cup Final which will be played at the home of Ryman Premier side Billericay Town, where the winners will face the winner of the second semi final between Stanway Rovers and Tilbury.
The match kicks off at 2pm this Sunday, the 9th of March at Mill Field. Entrance will be £3 for adults and £1 for kids so please come down and show your support for the next generation of Millers.