These DIY Petri Dish Jello make for an easy to make but oh so cute Halloween treat or party favor for your festivities.
We love sprinkles.
And the fact that this exceptionally easy DIY Petri Dish recipe is exactly 50% sprinkles makes us giddy.
We made these for our Halloween Mad Scientist Party, and they were a huge hit.
They also work for a science themed birthday party as a fun dessert or party favor.
Or you could make an adult version and fill them up with boozy jello shots!
Ingredients and Materials Needed to Make DIY Petri Dish Jell0
These are so easy to make and only calls for 3 items!
Jell-O — Or any other gelatin brand in the flavor of your choice
Sprinkles — To mimic microscopic bacteria. You could also use gummy worms, Nerds, candy eyeballs, etc.
How to Make DIY Petri Dish Jello
Step 1– All you have to do to create your own is make the Jell-O per usual as instructed on the box.
Then, pour the mix into the petri dishes.
Let them cool in the refrigerator.
Step 2 — And give them a dust of sprinkling just before serving them!
You can sprinkle in some candy before you allow the Jell-O to cool. Just be aware that the sprinkles may ooze out some coloring when wet.
Optional: We wrapped the Petri dishes with skull ribbon that we found at Paper Source so that the bottoms of the dishes wouldn’t fall off when someone picked them up.
Science or Halloween themed washi tape is another option!
More Fun Party Ideas
- 26 Simple Halloween Decor Ideas
- How to Make a Spook Stencil Drink
- DIY Pumpkin Halloween Candy Bucket
- Ghost Macarons
DIY Petri Dish Jello
- Petri dishes
- 3 oz gelatin in flavor of your choice
- Sprinkles to garnish
- Prepare the gelatin per the box instructions and pour the jello mix into the petri dishes. Chill in the refrigerator until set, about 1 hour or per time on the box.
- Garnish with sprinkles.
25 thoughts on “DIY Petri Dish Jello Recipe”
What size Petri dish did you use?
Hi! We used a standard size one that is 9mm diameter x 15mm deep.
I used nerds, try it, makes it really look like bacteria.
oh great, idea!
I just made these for my son’s birthday party. I used a Turkey vaster to fill the Petri dishes-it worked great! Thanks so much for sharing your idea?
Whoops! Baster not vaster!
The science nerd is me in exploding! I must make these for the next party with my lab coworkers.
hun where did you find those lab things? they are awesome!
All on Amazon!
Petri dishes are not food grade.
why not? new ones are sterils… used ones no, ever! but new ones, totally safe
Yep! You are correct!
Hi Michelle! Most petri dishes are made from polystyrene which the FDA considered food safe.
If you put the sprinkles in right away before the jello sits they will melt to look like mold for Halloween! My 4th grade students loved it! Check out my website for a picture!
love this, what a cute project to make with children
So so so so cute and SUPER awesome!!!
These are awesome! Where is the best place to buy petri dishes?
Those are so cute! The skull ribbon is the best touch!
Thanks Yelle :)
Dang, I wondered what was edible in those petri dishes, I love jell-O