CRUMBLE: Position a rack in the center of the oven and preheat the oven to 350ºF. Line a 13x9 baking sheet with parchment paper; set aside for now. Combine the peanut butter and the salted butter in a microwave-safe bowl and zap in the microwave in 30-second increments until the mixture melts and mixes. Mix the oats, flour, sugar, coconut (optional,) baking powder, and ground cinnamon together in a large bowl. Pour in the melted butter mixture and stir to combine until you form a sand-like crumb. Press two-thirds of the prepared crumb mixture into the prepared pan. You want to make sure the crust is tightly packed in.

SPREAD: Spread the jam over the oat crust layer.

BAKE: Top with the remaining crumb mixture on top. Bake for 40-45 minutes. Remove from the oven and place on a wire rack for one hour. I usually stick mine in the refrigerator for a few hours after that to cool them down completely before cutting into pieces. If you cut them right away, they’ll still be delicious, just not as neat!