Spray an 8 or 9 - inch square baking pan with non-stick cooking spray or line with parchment paper.
In a large sauce pan, over medium heat, melt butter. Once the butter is melted turn heat to low. Add 6 cups of mini maple flavored miniature marshmallows. Stir continually until marshmallows are melted and smooth.
Remove pan from heat and add milk and vanilla extract. Stir until well combined.
Add 6 cups Rice Krispie treats and remaining 2 cups mini maple marshmallows.
Stir until cereal and marshmallows mixture are well combined.
Add chocolate chips and stir again.
Place rice krispie mixture into prepared baking dish. Press gently with fingertips until spread.
In a microwave safe bowl add 1/2 cup white chocolate chips and 1 Tablespoon vegetable oil. Cook at 50% power for 2 minutes. Remove from microwave and stir. If needed place in microwave again at 50% power for 1 minute until chocolate is smooth and creamy.
Drizzle over top of rice krispies and sprinkle with holiday sprinkles and allow to set up for 1 hour, cut into bars, and serve.