Put your oven rack in the middle position and preheat to 350 degrees F (175C)
In a large bowl, toss the rolled oats, pumpkin seeds, chia seeds, sesame seeds, smoked paprika, onion powder, and garlic powder together.
Add the Cheddar and Parmigiano-Reggiano to the mixture and toss to coat evenly.
Spread the mixture onto a non-stick jelly roll pan (10.5 x 15.5 inches) and press down to make everything stick together.
Bake for 30-35 minutes or until the cheese has crisped and the granola is golden brown.
Remove the pan from the oven and while the granola is still hot, transfer it to to a cutting board and cut into squares or bars. Let them cool completely and store in an airtight container.
These savory granola bars taste best when left to rest for a day or two.
