Impossible Green Bean Pie

Ingredients

• 8 ounces fresh green beans, cooked and cut lengthwise into strips
• 1 (4 ounce) can mushroom stems and pieces, drained
• 1/2 cup chopped onion
• 2 garlic cloves, crushed
• 1 cup shredded cheddar cheese
• 1 1/2 cups baking mix (ex. Bisquick or Jiffy)
• 1 1/2 cups milk
• 3 eggs
• 1 teaspoon salt
• 1/4 teaspoon pepper