Preheat the oven to 350 degrees Fahrenheit. Spread the almonds across a large baking sheet and toast the almonds for 10 minutes. Let the almonds cool until they are just warm and not hot.
Transfer the almonds to a high-speed blender and blend until it turns creamy. The almonds will take time to blend, and if the mixture gets hot, stop and let it cool for a few minutes in between.
Once the almond butter is smooth and creamy, you can blend in add-ins such as cinnamon for a hint of spice.
Blend until the add-ins are evenly mixed and the butter is smooth again.
Let the almond butter cool to room temperature, and you can store it in the refrigerator for up to two weeks.