Preheat an oven to 300 degrees.
Line a baking sheet with parchment paper or foil. Coat with non-stick cooking spray and set aside.
In a bowl, combine cashews, pumpkin seeds, pecans, sunflower seeds and oats. Set aside.
In the microwave, melt peanut butter, oil, and Splenda Brown Sugar together. Stir to combine.
Pour peanut butter mixture over oat mixture and stir to coat.
Spread granola in a packed, single layer onto prepared baking sheet. Bake for 40-45 minutes, stirring every 10 minutes to ensure even browning.
Remove from oven and let cool completely. Break up granola and store in an air-tight container.