In a medium saucepan, bring oil to a simmer over medium-low heat, stirring often.
Add popcorn kernels in a single layer and cover saucepan with a lid. When the popcorn begins to pop (after about 2-3 minutes), shake the pot over the heat for about 3 minutes, until popping slows. Remove from heat immediately and let cool.
Make cookies and cream mixture.
Line a baking sheet with parchment paper and spread the popcorn out in a single layer.
In a glass, microwave-safe bowl, melt white chocolate chips for 20 seconds on 50% heat. Stir. Repeat until white chocolate is completely melted and smooth. Be careful not to overheat.
While chocolate is heating, place cookies in a gallon zip-lock bag and smash them with a rolling pin until you have large broken chunks.
Spread cookie crumbles over the popcorn, then drizzle with the white chocolate. Gently stir to combine evenly.
Sprinkle with sea salt. Let the popcorn cool on the pan. If desired, break apart any large clusters. Store in an airtight container for up to 2 weeks.
Notes
Since originally publishing this recipe, I discovered a better way to pop popcorn kernels in the microwave. Check out the recommended products section to see my favorite silicone, microwave popcorn bowl. I fill the kernels to the bottom line and then cook on High for 2 minutes and 30 seconds. It's always perfect.