Remove cauliflower core and stems, coarsely chop and place in steamer basket. Cook under tender-crisp, about 5 minutes. Place in a large bowl and using a potato masher, mash to the size of coarse crumbs.
In another bowl whisk together the egg, mustard, chili, garlic and seasoning. Gently stir in cauliflower , then add remaining ingredients, except the oil, gently tossing to combine.
Heat 2 Tbsp of oil in a skillet over med-high heat and place about 1/4 cup of mixture (I use a spring loaded ice cream scoop) into skillet, flattening slightly until they are about 3" wide. Flip once browned, adding more oil as needed until both sides are browned, about 6 minutes.