In a small bowl, set aside 1 tablespoon of mini chocolate chips and 1 tablespoon of pumpkin seeds. Line an 8x8-inch baking dish with parchment paper, letting some of the paper hang over the sides to make a sling.
In a large bowl, mix together the oats, Cheerios, and 3 tablespoons of pumpkin seeds.
In a small saucepan, heat the butter and honey over medium heat until the butter melts and the mixture starts to bubble. Let it bubble for 30 seconds, I found this keeps the granola bars from getting sticky later.
Remove the pan from the heat and add in the peanut butter and vanilla. Stir until smooth.
Pour the peanut butter mixture over the oats and stir until everything is coated. Add 3 tablespoons of mini chocolate chips and stir just enough to combine. Don’t mix too long or the chocolate chips will melt.
Transfer the mixture to the prepared baking dish and spread out to the sides. Lay a sheet of parchment or plastic wrap over the top and press down firmly with the bottom of a measuring cup or glass to pack the mixture tightly.
Sprinkle the reserved tablespoon of chocolate chips and tablespoon of pumpkin seeds over the top. Gently press them in so they stick.
Chill for 2–3 hours, or until firm. Once the granola bars are set, cut them into 12 bars while they’re still in the pan—this helps keep the edges neat. I like to use a metal spatula or bench scraper for this. Then, lift the bars out using the parchment paper sling. Enjoy right away, or store them at room temperature or in the fridge.