Discard outer leaves, remove core from both heads, then wash + dry leaves; slice into ⅛-inch strips + add to a bowl with chopped grape tomatoes; set aside

Wipe mushrooms with a damp paper towel, remove stems + scoop out gills; thinly slice, heat 1 tbsp oil in a skillet over med-high + sauté 3-4 min until tender; add salt/pep + seasoning blend

Meanwhile, stack 4 tortillas on a plate + wrap with a damp paper towel; microwave 15-30 sec or until warm + soft; divide to plates

Fill tacos with veggies + drizzle with each taco with ½ tbsp tzatziki