Line a 9x9-inch baking dish with parchment paper and set aside.
In a large pot or Dutch oven over medium heat, melt the 5 tablespoons vegan butter until fully melted.
Add the 10 ounces vegan marshmallows to the melted butter and cook, stirring often, about 5–6 minutes until the marshmallows are completely melted and the mixture is smooth.
Remove the pot from the heat and stir in 1 tablespoon non-dairy milk (or water), 1 teaspoon vanilla extract, and 1/4 teaspoon almond extract until combined.
Add the 4 1/2 cups brown rice crisp cereal and 2 tablespoons of the sprinkles, then gently fold until the cereal is evenly coated with the marshmallow mixture.
Transfer the coated cereal mixture into the prepared baking dish. Cover your palm with a small piece of parchment paper and press the mixture firmly and evenly into the pan.
Sprinkle the remaining sprinkles over the top and press them lightly into the surface using the parchment paper.
Allow the treats to cool at room temperature or refrigerate until firm, about 1 hour, then slice and serve.