Rinse your rice and add to a rice cooker, or pot if you are cooking it over the stove. Add the water and salt to taste. Set the rice cooker to cook, or cook over the stove as you normally would.
Dice up the onion and add to a large skillet with avocado oil and minced garlic. Sauté over med-high heat until onions are translucent and fragrant.
Add the ground meat to the skillet and be sure to break up the meat into small pieces. Add the paprika, garlic powder, cumin, chili powder, lemon pepper, and salt. Mix to combine. Then add the tomato paste and gently mix in.
Reduce the heat to medium, add your sliced mushrooms, and gently mix in to combine. Let simmer over medium heat, stirring occasionally.
Once the mushrooms have shrunk considerably in size and have cooked mostly through, add the cans of rinsed beans and corn. Be sure to rinse and drain these. Mix the beans and corn into the mixture until well combined. Reduce the heat to low and cover for about 10 minutes.
Now it's time to assemble! Add your rice to a bowl, then layer with shredded lettuce and meat mixture. Top however you like, with pico de gallo, cilantro, chives, guac, etc. Tortilla chips make a great side as well!