Line a rimmed baking sheet with parchment or a silicone mat. Set aside.
Melt butter, sugar, water, and salt in a heavy saucepan over medium heat, stirring until sugar dissolves.
Clip a candy thermometer to the pan. Cook at a steady bubble, stirring occasionally, until 290–300°F.
Remove from heat and carefully stir in vanilla. The mixture will bubble.
Pour the hot toffee onto the prepared sheet. Spread into a thin, even layer.
Scatter chocolate chips over the surface. Let stand 2 minutes to soften.
Spread melted chocolate into a smooth layer with an offset spatula.
Sprinkle almonds evenly over the chocolate. Press gently so they adhere.
Cool completely until firm. Break into pieces and serve.
Notes
Variation: Swap almonds for pecans or peanuts, or finish with a pinch of flaky sea salt. For mocha toffee, stir 1/2 tsp espresso powder into the chocolate before spreading.Storage: Keep in an airtight container at room temperature for up to 2 weeks, or refrigerate for a snappier bite.This recipe is an original creation inspired by classic Easy English Toffee Recipe flavors. All ingredient ratios and instructions are independently developed.