Keto Philly cheesesteak lasagna

INGREDIENTS

• 1 pound shaved beef
• 1 bell pepper sliced thin
• 1 onion sliced
• 1/2 cup mushrooms, sliced or chopped
• 1/4 cup mayo
• 1 tsp garlic powder
• 1/4 cup grated Parmesean cheese
• 1/4 cup heavy cream
• 1 1/2 tbs butter
• salt & pepper
• 10-12 slices provolone cheese
• mozzarella to top
• 4 sheets of cutda carb flatbreads