Preheat your oven to 350°F and line a baking sheet with parchment paper or grease the sheet with butter.
In a small saucepan, melt butter over medium heat until it begins to foam and turn golden brown, remove from heat and let cool slightly.
In a mixing bowl, whisk together browned butter and brown sugar until smooth.
Add vanilla, egg, and egg yolk and mix until combined.
Stir in almond flour, baking soda, and oats. Do not overmix.
Fold in crushed mini eggs.
Let the dough rest for 15-20 minutes to hydrate the oats.
Scoop dough into cookie balls and place on the baking sheet.
Bake 8–10 minutes, until edges are set but centers still look soft. Mine were done at 9 minutes.
Cool on the pan for 5 minutes before transferring to a rack. They should still be soft and will harden as they cool.