Preheat oven to 400 degrees F. Prepare a baking sheet with either parchment paper laid on top or spray with cooking spray
Place cod filets on paper towels to drain of water and pat dry. Place on baking sheet.
In a small bowl, combine the lemon zest, lemon juice, crushed almonds, dill, oil, salt and pepper and chili spice if using.
Spread each cod filet with a tsp or so of Dijon mustard,smoothing it over the entire top of the filet. Divide the almond mixture among the 4 filets, pressing it evely into the mustard with your hands.Bake the fish until opaue at the thickest part, about 7 minutes for most.cod filets (less time for thin filets).Serve with a green vegetable and lemon slices for a great low carb or keto fish dinner.