Preheat the oven to 350°F and line a 13x9-inch nonstick baking pan with cooking spray.
In a large bowl, beat the peanut butter, honey, egg, oil and vanilla extract with a handheld beater until smooth and creamy.
In a separate medium bowl, stir together the oats, brown sugar and salt. Add the oat mixture to the peanut butter mixture and stir until well combined then stir in the peanut butter chips and mini chocolate chips.
Transfer the mixture to the prepared baking pan, pressing it into an even layer.
Bake for 12 to 15 minutes or until the edges are golden brown. Remove the pan from the oven and let it cool completely before slicing the granola into bars and serving.
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