Combine ½ cup soap and 1 cup warm water in a large mixing bowl.
Using a hand mixer, stand mixer, or blender, whip on high speed for 1–2 minutes until thick, fluffy peaks form.
Stir in a few drops of food coloring. For multiple colors, divide foam into separate bowls and color each batch.
Pour bubble foam into your sensory bin (or cauldron). Add Halloween toys for kids to scoop, grab, and find.
Hand kids their scoops, tongs, or spoons and let the Halloween fun begin!