Line a rimmed baking sheet with parchment paper and arrange the graham crackers on top so that they're side-by-side.
Heat the butter, sugar and salt in a saucepan over medium heat, whisking. Once it starts to bubble, heat for 3 more minutes, then carefully pour over the graham crackers, spreading it out evenly with a spatula. Bake until bubbling, 8 to 10 minutes. Remove from the oven and immediately sprinkle on the yogurt chips; let them melt for a few minutes. Use an offset spatula to spread them evenly all over. Add a few drops of food coloring, if desired, and swirl it around to get a marbled effect. Scatter on the gummy bears, a pinch of flaky salt and sprinkles, if using. Let set in the fridge until firm, 1 hour or up to overnight, then cut or break into pieces. Enjoy!