Preheat the oven: Preheat your oven to 350°F (175°C). Line a rimmed baking sheet with parchment paper or foil and lightly grease it.
Arrange the crackers: Place the saltine crackers in a single layer across the prepared baking sheet, covering the entire surface. Break crackers if needed to fill gaps.
Prepare the toffee mixture: In a saucepan over medium heat, melt the butter. Add the brown sugar and stir continuously until the mixture begins to boil.
Boil the toffee: Allow the butter and sugar mixture to boil for 2–3 minutes, stirring gently, until thick, smooth, and glossy.
Pour over crackers: Carefully pour the hot toffee evenly over the crackers. Use a spatula to spread it so all crackers are fully coated.
Bake: Place the tray in the oven and bake for 5 minutes, or until the toffee is bubbly.
Add the chocolate: Remove from the oven and immediately sprinkle the candy melts or chocolate chips over the hot toffee. Let sit for 2–3 minutes, then spread evenly once melted.
Decorate: While the chocolate is still warm, sprinkle Valentine’s sprinkles evenly over the top.
Cool and set: Let the candy cool completely at room temperature or refrigerate until fully hardened.
Break and serve: Once set, break into pieces and serve or package for gifting.
