Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a saucepan over medium heat, cook the bacon until crisp. Remove and drain on paper towels, then chop into small pieces.
In the same saucepan, melt the butter and brown sugar together, stirring constantly until the mixture comes to a gentle boil.
Stir in the maple syrup, vanilla extract, and sea salt. Continue to boil for 3 minutes without stirring, then remove from heat.
Place the saltine crackers in a single layer on the prepared baking sheet. Evenly distribute the cooked bacon pieces over the crackers.
Pour the caramel mixture over the crackers and bacon, ensuring even coverage. Use a spatula to gently spread it if necessary.
Bake in the preheated oven for 15-20 minutes or until the caramel is bubbly and slightly darkened.
Remove from the oven and let cool completely on the baking sheet before breaking into pieces.
If desired, sprinkle chopped nuts over the top while it's still warm and let them set with the caramel.