Spray a medium skillet with cooking spray and heat over medium heat. Add in garlic and cook for 2-3 minutes until lightly brown. Add in beef, smoked salt and fresh cracked black pepper. Heat al the way through about 5-6 minutes.
While beef is heating up, chop tomatoes and lettuce and dice the avocado. You may also heat tostadas in a 350 degree oven if you'd like.
Top tostadas with beef, cheese, lettuce, tomato and avocado as desired.