The simple answer is that hazel eyes are recessive but they can also be produced from the way eye color genes interact.
There are multiple genes that work
together to create eye color. Geneotype is the physical traits a person carries. Phenotype is the actual display of color you see in a person's eye. A person recieves genetic codes from both parents to determine eye color. The dominant genetic structure genereally produces the eye color of offspring.
The 7th grade answer is that green or "hazel" are recessive; both parents have give the offspring the genetic code for green eyes. Blue are dominant over green; both parents can give the codes for blue eyes OR one parent's code for blue eyes trumps the other parents code for green eyes. But, brown eyes are the dominant gene over both colors. So, if one parent provides the genetic codes for brown eyes then it would not matter if the other parent provided code for any other color.
The college level answer is that genetic combinations can result in a vast array of beautiful color cominations of bronw eys with flicks of gold. Also an overpowering masking gene may be involved where genetically the offspring has brown eye genes but the actual eye color may be blue or indeed considered "hazel"