In a large mixing bowl, combine the white whole wheat flour, oat flour, baking powder, and salt. Whisk together until well blended.
In another bowl, whisk together the buttermilk, vanilla extract, eggs, melted butter, honey, and lemon zest until smooth.
Pour the wet mixture into the dry ingredients and stir until just combined. Be careful not to overmix; some lumps are perfectly fine. Gently fold in the chocolate chips, chopped pistachios, and walnuts.
Preheat your non-stick skillet or griddle over medium heat. Lightly grease with a bit of butter or cooking spray, if necessary.
Using a ladle or measuring cup, pour about 1/4 cup of batter onto the skillet for each pancake. Cook until bubbles form on the surface and the edges look set, about 2-3 minutes. Flip and cook for an additional 2-3 minutes until golden brown.
In a small saucepan, combine the honey, vanilla bean seeds, reserved vanilla pod, and sea salt. Heat over low heat until warmed through and fragrant, about 5 minutes. Remove from heat and discard the vanilla pod.
Stack the pancakes on plates, drizzle with the salted vanilla honey syrup, and garnish with extra chopped nuts if desired. Enjoy your Chocolate Chip Lemon Baklava Pancakes with Salted Vanilla Honey Syrup warm!