Soak the dates in a glass bowl or cup of warm to hot water for 15-20 minutes
Preheat the oven to 350°F
While the dates are soaking, combine the egg (or applesauce), applesauce, chia seeds, maple syrup, vanilla, and nut butter in a medium-sized mixing bowl
Mix in the oats, protein, cinnamon, and sea salt
Remove the dates from the water and in a food processor or blender, blend the dates briefly until they’re chunky*
Fold in the dates and make sure the mixture is completely combined – you don’t want to see any powder from the protein, cinnamon, or salt
Incorporate any optional mix-ins
Between 2 pieces of parchment paper, roll the dough out to ~1/4” thick – think of it as rolling out sugar cookie dough
Remove the top piece of parchment paper and transfer the bottom piece of parchment with the dough onto a pan or baking sheet
Bake for 11-13 minutes (for vegan bars, bake 5+ minutes longer) until the bottom and edges start to turn golden brown
Remove from the oven, drizzle any optional chocolate, caramel, etc. on top, cut into squares or bars, and let cool completely before storing in an airtight container