Safety - your child is far safer if supervised and taught about the risks in the home properly by yourself rather than wrapped in cotton wool and never exposed to danger at all. Use your common sense re heat/sharp knives/heavy pots etc as every kid matures at a different rate.
Cooking (supervised) helps with all kinds of skills from reading/maths/hand-eye co-ordination/social skills in a way that DS finds lots of fun. The fun element is really important as he struggles so hard in school at times. Does it matter if "reading practiice" is a recipe rather than a story for an asd kid? Or is it more important that he spends 1/2 an hour reading enthusiatically to choose the recipe he'd like to try?
With the emphasis on "healthy eating" and kids weight at school, more children than ever before are developng serious eating disorders very young. ASD kids are known for having very limited diets but I can think of several of his NT friends (esp the girls) who would fret less about their weight if they were more directly involved in food prep at home. These are 7-8 year olds!
It's a great way of introducing new variety to children's diets and I've noticed anecdotally that those kids who cook at home are far less "fussy" eaters generally.
DS can tell you if the meal contains protein, calcium, vit c, carbohydrate etc and is balanced. As he gets older he gets more involved in meal plannng and grocery shopping. Online shopping is great for his maths skills as we can sit and discuss food choices for the week.
Meal planning and budgeting are crucial life skills and again the excercise pleases his school teacher as he has to read and use maths. At the moment he's looking at the price per kg and comparing pack sizes to find the best deal. It's great for primary aged maths but too simplistic compared to the NC to have the same educational value for a secondary child.
Lots of children without find school work more interesting if you can apply it to the real world in some way (not everyone has a philosophers temperment!). This is something even the poorest sngle Mum can do to help her child that actually cos of numbers and the constraints of the classroom environment is much harder for schools to implement.
I've met too many "academic" familes whose kids are serously lacking in life skills at Uni. I also think parents forget the "cute" stage is very brief and that actually our kids could choose to rebel and legally leave home and have their own kids at 16. Not all Mums get the amount of time they expect to prep their kids for the "real world". Parenting is all about getting our kids ready to live independently without us. (This is something I think sadly sen parents are more aware of than the those without disabilties sadly.)