Preheat Oven: Heat to 375°F. Line a large baking sheet with parchment paper.
Cook Sausage: In a large skillet over medium heat, cook sausage, breaking it up until no longer pink (about 7 minutes). Transfer to a paper towel-lined plate to drain and cool slightly.
Cook Vegetables: In the same skillet, cook shallot and mushrooms over medium heat for 5 minutes. Add kale and cook for another 2 minutes until softened. Sprinkle with a pinch of salt.
Combine Mixtures: In a large bowl, mix the sausage, mushroom-kale mixture, almond flour, baking powder, salt, and pepper. Add beaten eggs and mix well. Fold in crumbled feta.
Shape Biscuits: Use a cookie scoop to drop mixture onto the baking sheet.