Perfectly Sweet Seed Bars

Name: Perfectly Sweet Seed Bars
Ingredients: 1 cup walnuts; 1 1/2 cups rolled oats, divided; 1 scant cups shredded unsweetened coconut; 1/4 cup flax seeds; 1/4 cup chia seeds; 1/2 cup raw pumpkin seeds; 1/2 cup raw sunflower seeds; 1/2 teaspoon ground cardamom; 3 tablespoons melted coconut oil (plus more for greasing pan); 1/2 teaspoon coarse sea salt; 1/4 cup light agave nectar (can sub honey or brown rice syrup, but sweetness will vary); 2 tablespoons maple syrup; 1 teaspoon vanilla extract