Finely crush the graham crackers by placing the crackers in a: Ziploc bag and rolling over it with a rolling pin, baggie or deep bowl using the bottom of a glass jar, or food processor
Transfer the crushed graham crackers to a mixing bowl, add the other crust ingredients, and fold and press together until the mixture is combined
Line a pan (8x8, 9x9, or even a bread loaf pan will work) with parchment paper, evenly press the crust mixture along the bottom of the pan, then let it set in the fridge (for ~1 hour)*
Put all of the fudge ingredients except the vanilla in a microwave-safe bowl and melt in 15-30 second increments – stirring thoroughly between each, only returning it to the microwave when the chocolate no longer continues to melt from stirring – until smooth, then stir in the vanilla*
If you’re topping with raw pecans or leaving the fudge plain, skip this step: take two small bowls or containers and mix the Stevia brown sugar and cinnamon together in one, and add 1” or so of water to the other, then set aside
Remove the crust from the fridge, then pour and spread the melted chocolate mixture evenly on top of the crust
If you’re leaving the fudge plain, skip this step. If you’re using raw pecans or another topping, add the topping(s) now. Otherwise, one at a time, dip a pecan into the bowl of water, roll it in the cinnamon and sugar mixture until it’s fully coated, then lightly place it on top of the fudge
Move the fudge to the fridge and allow it to set until it’s firm throughout, then it’s ready to eat – continue to store the fudge in the fridge*