Preheat your oven to 180 degrees Celsius (360 Fahrenheit)
Prep your tin: I cook this veggie slice in a slice tin. Mine is approximately 20cm x 30cm. I spray the tin with oil, then I line it with baking paper. I line it in a way that the paper drapes over the long edges of the tin, this allows me to easily lift out the slice when it is cooked.
In a large mixing bowl whisk the eggs, milk and flour. Don't worry if it's a bit lumpy, the lumps bake out.
Stir through the remaining ingredients: Cauliflower, Broccoli, Onion, Cheese, Corn Kernels. Season with salt and pepper to taste (skip the salt if you are going to use this recipe for baby led weaning)
Pour the veggie slice mix into your slice tin. Bake at 180 degrees for 20 minutes or until the slice has risen, all the egg is cooked and the slice is golden brown on top.
Cool, then enjoy!