Preheat oven to 350°F (175°C). Line a 9"x13" baking pan with parchment paper, leaving an overhang on two opposite sides to lift the bars out later; lightly grease the parchment and any exposed pan with non-stick spray. Set the pan aside.
In a large bowl, stir together the dry ingredients: quick rolled oats, light brown sugar, oat flour, finely ground sea salt, ground cinnamon, salted peanuts, salted almonds, walnuts, sour cherries, and mini chocolate chips until evenly combined.
In a separate bowl, whisk the creamy peanut butter, melted coconut oil (or canola oil), and honey or maple syrup until smooth and combined.
Pour the wet mixture over the dry mixture. Use a rubber spatula to mix everything until the dry ingredients are evenly coated and the mixture holds together in a crumbly mass.
Transfer the mixture to the prepared pan. Press it down very firmly and evenly so it is tightly packed (use the bottom of a measuring cup or the flat of a spatula to press it).
Bake in the preheated oven for 30–35 minutes, or until the top and edges are golden brown.
Remove the pan from the oven and allow the bars to cool completely in the pan (they will firm up as they cool).
Once fully cooled, lift the slab from the pan using the parchment overhang and place on a cutting board. Use a very sharp, preferably serrated, knife to cut into rectangles.
Store the granola bars in an airtight container at room temperature, in the refrigerator, or in the freezer.