Line an 11x7 inch baking dish with foil or use a silicone brownie bite pan with 24 cavities. Arrange almonds in a single layer on the prepared surface. Set aside.

In a heavy-bottomed saucepan, combine the butter, margarine, granulated sugar, kosher salt, and vanilla extract. Cook over medium-high heat, stirring constantly with a wooden spoon, until the butter is melted. Bring the mixture to a rolling boil.

Continue boiling and stirring for an additional 5-7 minutes, or until the candy reaches the color of almonds (approximately 300 degrees Fahrenheit). Carefully pour the hot toffee mixture over the arranged almonds. If using a brownie bite pan, work quickly to get the toffee into each cavity, a small metal scoop can be helpful.

Allow the toffee to cool completely. This will take approximately 2 hours.

Once the toffee is cooled and set, spread the melted milk chocolate evenly over the top. Immediately sprinkle generously with the ground walnuts. If you want to coat both sides, use only half of the chocolate and walnuts for the top, let it set, then flip the toffee over and repeat on the bottom. Once fully set, pop the toffee bites out of the silicone pan or cut into pieces. Enjoy!