Preheat the oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone mats so the cookies don’t stick.
In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
In a large bowl, beat the canola oil and sugar with a hand mixer (or stand mixer) until smooth and creamy. Mix in the vanilla, then add the eggs one at a time, beating well after each one.
Add the dry ingredients to the wet ingredients a little at a time, mixing just until the dough comes together. Don’t overmix, or the cookies can turn out dense.
Stir in the milk chocolate chips, white chocolate chips, and Cadbury Mini Eggs with a spatula or wooden spoon until they’re evenly spread through the dough.
Scoop rounded spoonfuls of dough onto the baking sheets, leaving about 2 inches between each cookie to give them room to spread.
Bake for 10–12 minutes, until the edges are lightly golden and the centers still look a little soft. That’s the secret to a chewy cookie.
Let the cookies cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely.