Preheat oven to 325°F (163°C).
In a large bowl, whisk together dry ingredients.
Separately, mix warm milk and ground flax seed. Allow to gel up for a few minutes.
Whisk agave nectar and apple cider vinegar into milk mixture.
In a separate bowl, add dry and wet mixtures and mix well to combine. (The dough will be thick!)
Pour into a loaf pan (I used a 9x5-inch) lined with foil or parchment. Sprinkle rolled oats or seeds of choice on top and cover loaf with a foil tent.
Bake for 90 minutes total: 45 minutes with a foil tent, then remove the foil tent and continue baking for another 45 minutes, until the bread is lightly golden. It should spring back when touched. (Test with a toothpick to see if it comes out clean!)
Cool completely before removing from the pan and slicing. (Tip: Once cooled, refrigerate the entire loaf before slicing it. This can help reduce any gumminess and produce cleaner bread slices.)
Enjoy!
Store in a zip-top bag or airtight container at room temperature for 5-7 days. In hotter or more humid climates, you may want to store in an airtight container in the fridge.
Yields 12 slices.