Heat a medium skillet over medium heat, then add 1 Tbs olive oil. Toss in mushrooms and onion and cook, stirring for about 5 minutes. Sprinkle in 1/2 tsp. salt and sauté for 5 minutes more. Stir in garlic and lemon juice and cook for another minute, then remove pan from heat.
Beat eggs in a medium-large bowl. Whisk in flour and remaining salt. When all is mixed stir in mushrooms, including any pan juices. Add wild rice, cheese, and black pepper and stir well.
Wipe out the skillet and heat over medium for about 1 minute. Swirl in 1/2 Tbs olive oil and about a teaspoon of butter. When pan is hot enough to sizzle a crumb, use a 1/4 cup measure to scoop pancakes into the pan. Fry for 2 to 3 minutes on each side, or until golden.